LEGO Glossary

“I really like your new MOC, it has a lot of SNOT techniques and NPU with that Seed Part you got from our last AFOL meeting!”

What the heck are you talking about? Some alien language? Well for sure if you are new to this LEGO hobby you may caught up in a situation like that. No worries, you can find the answer for all those “alien LEGO language” here:


Stands for Acrylonitrile Butadiene Styrene which is the plastic LEGO® are made of. Its chemical formula, as everybody of course knows, is (C8H8)x· (C4H6)y·(C3H3N)z.

Adult Fan of LEGO. The most common term used to refer to LEGO fans who are adults. Generally pronounced to rhyme with “hay-foal.” See also ALE and ALH.

Adult Inner Circle. A relatively new idea formed by TLG for testing their products. See also KIC.

Adult LEGO Enthusiast. Some LEGO fans prefer to be called enthusiasts rather than fans, attempting to avoid the perceived stigma of the word “fanatic.” See AFOL.

Adult LEGO Hobbyist. Another alternative self-descriptive name preferred by some LEGO fans over AFOL or ALE.

Accurately Realized Scale Engines. Trains that are built to a size larger than actual LEGO® trains but are scaled to actual trains.


1. A passing interest of yours in theme, category, etc.
2. A passed theme of LEGOs such as Jack Stone(also opposed to recurring themes such as town, castle, and Star Wars.)

BI: (bee-aye)
Building Instructions. Usually used in LUGs* and instruction sites.

Bignette: (big-net) or (binyet)
The size may vary but bignette’s general area is between a vignette and a diorama.

Blearsk: (blee-ersk)
The newer shade of mearsk blue.

Billund, Denmark. Headquarters and primary design center for The LEGO Group.

Bley: (blay)
Referring to the color scheme change in 2005.
Bley is a mix between blue and grey because of the bluish color added to the greys.

Bloun: (blouwn)
The new redder brown.

Brick Nerd. A Popular news and MOC blog.

Built Of Lots Of Colours. A model made up of parts in multiple colours, generally by necessity rather than design, and usually the work of young children, as in “That kid’s model is BOLOCs”.

A LEGO creation or portion of a larger creation that is composed of multiple LEGO elements even when a larger, pre-fabricated LEGO element or custom accessory may be available. Solving a LEGO problem through brick-built means is generally respected more than using a prefabricated or custom element.

BA: (bee-arms)
Brick Arms, a popular custom site, specializing in weaponry of WW2.

BL: (bee-link)
Bricklink, the biggest LEGO marketplace outside

BF: (bee-forge)
Brick Forge, a popular medieval custom site.

Buying the Cakes:
A Term coined at LL Windsor for an illegal move. Such as gluing a piece onto a studless area. See also illegal move.

Big Ugly Rock Piece. A large, pre-fabricated LEGO element generally available in gray and frequently included in LEGO castle sets. More experienced LEGO fans often encourage other builders to use brick-built landscaping rather than BURPs.


Computer Aided Design such as LDD*.

C-C or CC: A LEGO castle fan site with an associated online community, the Forums.

Character and Creature Building System.
This is what LEGO calls their new line of elements that are used to build figures. It was released in 2011 in during Hero Factory’s second year and has been utilized since. Themes that include it are: Hero Factory, Bionicle, Super Heros (see UB), and Legends of Chima (also UB).

Cheese Slope:
A LEGO element with a 33° slope, 1 stud by 1 stud wide and two plates high (or 2/3 of a brick high). Part number 50746. Useful for adding fine detail to LEGO creations. Named after the fact that yellow and orange pieces look like a wedge of Cheddar cheese.

Construction toys “compatible” with LEGO created and sold at lower cost, designed to compete with LEGO brand building bricks. Considered off-limits by most LEGO fans.

COW: (cow) or (see-oh-double-you)
Curved Out Wedge
1.A slope in brick form.(see picture)
2.Some other debates lead belief that
it is a brick much like a regular
slope with more of a dome curve.

A descriptive name for BrickLink, referring to the addictive nature of being able to buy individual LEGO elements and minifigs in whatever quantity the buyer wants.

Another endearing term for Megabloks and other clones.

Crummy Ramp And Pit Plate. It is the baseplate with the ramp leading to the pit.

Classic-Space Forums. An online LEGO space fan community on

A LEGO creation or individual element that uses non-LEGO parts or modified parts, including decals, paint, or accessories from third-party vendors like BrickArms, BrickForge, and Big Ben Bricks. Contrast with Purist.


Dacta: (dactuh)
Referring to the Educational LEGO line.

Dark Ages:
That period in a LEGO fan’s life when he or she sets aside LEGO in favor of school, dating, motor vehicles, and other non-LEGO pursuits.

Stickers added to bricks to give additional detail.

A Surplus of one piece.

Diorama or Dio:
A large LEGO scene or a LEGO scene built on an irregular base. See also Bignette and contrast with Vignette.


An activity common at LEGO club meetings, in which LEGO fans each bring a copy of a LEGO set, sort out all of the LEGO elements, and take turns picking the parts they want. An easy way to get the parts you want in larger quantities without buying multiple copies of the set yourself. Read more on

Dreaded Sticker Sheet
A sheet of stickers supplied with a LEGO set and designed to be applied to the LEGO pieces.


From Bricks to Bothans. A LEGO Star Wars fan site and online community.

Referring to the technique that suspends a brick or piece with no connection.


Pseudo-technical detail added to a LEGO creation to enhance its appearance. Frequently seen in LEGO space and mecha creations.

Grűschteling: (Groo-shtell-ing)
This is one of my favorites. The sound made when sifting through mass LEGOs. Music to my ears.


Half-Stud Offset:
A building technique that allows a LEGO fan to build without regard to the standard alignment of studs on a plate. See also Jumper Plate.

Hands in pockets:
The earlier minifig torsos with no arms but small ridges along the sides.

Hillary (Harry) Fisher Page:
He designed the LEGO brick.


LEGO building techniques that break the “rules” for connections between LEGO elements used by official LEGO set designers — particularly connections that stress the LEGO elements. For example, inserting a plate between the studs on a brick.

The list of LEGO elements that are included in an official LEGO set. Several LEGO fan sites host set inventories, including Peeron and BrickLink.

10030 Imperial Star Destroyer. A large LEGO set frequently used as a scale reference for very large LEGO fan creations. See also UCS and Parts Pack.


Jumper Plate:
A 1×2-stud LEGO plate with only 1 stud in the center. Useful for half-stud offset building.


KABOB: (ka-bob’)
Kid with A Bucket OF Bricks.

Kid Fan of LEGO. The LEGO Group’s primary target demographic — boys aged 5-12. Most online LEGO fan sites do not allow participation by KFOLs due to COPPA regulations.


Lego Digital Designer.
Free software for PC and Mac that lets you build LEGO models virtually. Up until last year you could even upload your designs to LEGO and order the pieces to build your masterpiece, alas no more.

LEGO building techniques that follow building guidelines for official LEGO set designers. See also Illegal and Purist.

Oh no you didn’t! Technically, the official plural form for more than one element of LEGO is “LEGO® brand building bricks”. That’s ridiculous, though, so most LEGO fans refer to one or more bricks as “LEGO”, following the grammatical convention of “fish” and “sheep.”

LEGO Users Group, such as SEALUG and WAMALUG. Initially used to describe a local or regional LEGO club that met and interacted primarily in an offline or “real world” context, the term LUG has been extended to include virtual and even ephemeral groups of LEGO fans, such as JLUG, ChiefLUG, and KeithLUG. Many LUGs now also have an online presence, further blurring the line between traditional LUGs and online LEGO fan communities.

LUGnet, a site that connects online LUGs.

Little Ugly Rock Piece. Compared to BURP* but more triantle looking.


Slang for the macaroni curved brick.

A New minifig appearing in the 2010 Game series.

My Own Creation. Any LEGO creation designed and built by a LEGO fan without instructions. Generally pronounced “mock.”

A set that you buy strictly for the pieces, rather than because of the set design. The pieces are meant to feed your MOC building, hence the name “MOCFodder”.

Mint In Sealed Box(bag).

Manufacturer’s Suggested Retail Price. The official price for a LEGO set as established by the LEGO Group for a particular market. Individual retailers may set their own prices higher or lower than MSRP, and MSRP may vary from country to country. See also TRU and S@H.

Mini Ugly Rock Piece.


Nice Part Use. An unexpected way to use a LEGO element in a model. Often overused in praising a LEGO creation.

Non LEGO Significant Other. Other applications include, friend, spouse, parent etc. Don’t ask.


Parts Monkey:
That selfless person who kindly finds pieces for you. We all know one.

Parts Pack:
An official LEGO set that has many desirable LEGO elements but which may not have an overall design that appeals to adult LEGO fans. See also ISD.

Pick a Brick found in LEGO stores and online.

We all know them and we all hate them. They’re those buggers who run around stealing ideas and accrediting them as their own. If you use someones idea then point the finger at them not at yourself.

A LEGO element used in the place of desired element until the correct piece arrives from Bricklink.

A LEGO creation that does not include any customizations, such as decals, modified parts, or custom accessories from third-party vendors like BrickArms, BrickForge, and Big Ben Bricks. A form of religious fundamentalism. Contrast with Custom.

Part that could or should be made Of Other Parts. One could be very literal with this and say that all pieces are POOP.


Q Element:
Parts in colors that did not come in an actual LEGO set. Namely Pieces that are mold tests. Collectibles to the core.


Rainbow Warrior:
The type of multi-colored LEGO creations that we all built when we were eight years old.

Rocking horse Poo:
Very hard to find elements. “Thats as rare as rocking horse poo!”

The standard 2×4 Brick. I bet the people on MOCtag didn’t know that.

Recommended Retail Price.


LEGO Shop at Home. The old name for The LEGO Group’s direct-to-consumer sales channel, particularly the printed catalog and telephone service. Now also used by long-time fans to refer to the LEGO Shop online. These direct channels are often the only place to ensure that you pay MSRP.

Seed Part:
An ordinary piece put to extraordinary uses.

Significantly Huge Investment in Parts. A very large LEGO creation — particularly a LEGO space creation. As used in the LEGO space fan community, a SHIP is generally at least 100 studs long.

The minifig version of a LEGO fan that he or she uses in online communities as an avatar, from “signature minifig.” Sigfigs may or may not resemble the person physically, as LEGO fans used to interacting with each other online discover at LEGO conventions.

Studs not at Right Angles.

Studs Not On Top. A building technique that places LEGO elements on their sides or even upside down to achieve the shape or structure the builder wants in their creation.

SNIR: (sner)
Studs Not In a Row. Generally applying to half-stud offsets and sphere designs.
a. SNIR 27 developed by Reinhard Beneke using jumpers* and regular plates to give it depth and texturing.
b. SNIR 45 developed by Eric Amzallag by twisting a 1×1 plate(brick) until it is at a 45 degree angle to the underlying plate.

Specific Part Again used Multiply. I know there are different variations but this is the one I found to be the most common.

Special Part Used Again. An example(for all those castle lovers) would be the cowl. Discontinued in 1979 then again reappeared in 2009.

STicker Across Multiple Pieces.
The deeply unpopular phenomenon of stickers covering multiple parts simultaneously, meaning that when deconstructing a set you either have to carefully remove and somehow save the sticker, or else leave the sticker attached and lose the ability to use those pieces for anything else. LEGO thankfully seem to be doing this much less these days.

A quality that allows a LEGO creation to be picked up and flown around a room as the builder makes flying noises.


The Brothers Brick. A Popular news and MOC blog.

Teen Fan of LEGO. LEGO fans who may be past the primary target demographic for LEGO sets, and who are likely avoiding their Dark Ages.

The LEGO Company. See TLG.

The LEGO Group. The privately held parent company for all LEGO-related brands and companies worldwide.

Toys ‘R’ Us. Though roundly criticized by LEGO fans for inflated prices, Toys ‘R’ Us frequently has LEGO sets earlier than any other retailer (including LEGO) as well as a broader selection than most. See also MSRP.


Ultra Build.
Subseries of buildable figures for a theme other than Bionicle or Hero Factory (Super Heros and Legends of Chima have them).

Ultimate Collectors Series. An irregular series of large LEGO Star Wars sets designed for older builders. Frequently used as a scale reference for LEGO fan creations that are larger than minifig scale. See also ISD.


A Slope opposite of inverted.

Vignette or Vig:
A small LEGO scene, usually built on a base 8 studs long by 8 studs wide. Contrast with Bignette and Diorama.


Work In Progress. We all have one.


The Brothers Brick
MOC Pages
Gimme LEGO