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A programmable robotics brick released by the LEGO company in late July 2006 and uses Technic connectors. This was preceded by the original RCX brick, and succeeded by the EV3 brick.

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LEGO Mindstorms NXT is a programmable robotics kit released by LEGO in late July 2006. It replaced the first-generation Lego Mindstorms (Robotics Invention System), and was replaced by the third-generation in Fall 2013.

The base kit ships in two versions: the Retail Version (sets #8527 and #8547) and the Education Base Set (set #9797).

It comes with the NXT-G programming software, but a variety of unofficial languages exist, such as NXC, NBC, leJOS NXJ, and RobotC. A new version of the set, the Lego Mindstorms NXT 2.0, was released on August 1, 2009, featuring a color sensor and other upgraded capabilities.

See the following question for details of the differences between NXT and its precursor RCX.