A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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12V was a voltage standard for LEGO Trains sets from 1969-1993. It is no longer used in any modern products by LEGO.
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Any type of components or tools not directly endorsed by LEGO or it's affiliates.
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Questions about LEGO advent calendars.
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An acronym for "Adult Fans Of Lego".
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Questions regarding building techniques and practices of LEGO stop-motion animation.
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Questions based on sets from our Annual Support Package from The LEGO Group
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For use in question regarding Lego apparel: T-Shirts, watches, and other items of wear.
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Questions relating to the Lego Architecture theme
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Related to operating constructions without human interaction. This often involves Mindstorms, but can also involve other hardware and software.
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challenges that involve building a LEGO set within its original sealed packaging.
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For question-related to balls in LEGO sets.
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Questions about the LEGO product line Bionicles which is a story-based character-focused building theme with science fiction elements.
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A proprietary open wireless technology standard for exchanging data over short distances. Used by the NXT for communication between the programmable brick and a PC or Mobile device.
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a robotic system aimed at children between 7 and 12.
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an e-commerce site that allows registered users to buy/sell/auction parts, sets, and other LEGO related items.
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A service provided by LEGO group for ordering individual bricks and other LEGO pieces.
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Interested in building techniques? Then this is the tag for you.
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2D & 3D Computer Aided Design (CAD)
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LEGO Theme of sets involving knights, castles medieval life and occasionally fantasy.