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I was wondering what the official reason behind the name of LEGO's latest MINDSTORMS robotics platform. What does "EV3" stand for?

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Yes, and I have said so in my answer. The FAQ page was not available when I wrote my answer. Thanks for the heads-up though, I've updated my answer for an additional source link. Also, generally answers should be longer then a link and a line of text :) – shea Feb 13 '13 at 5:40
up vote 9 down vote accepted

From the official EV3 FAQ:

What does EV3 stand for?

This is the third generation of the LEGO MINDSTORMS platform and the "EV" stands for evolution, hence EV3.

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...and presumably the number 3 comes from the fact it's the successor to NXT 2.0? – Ambo100 Jan 19 '13 at 13:33
@Ambo100 No, I don't think so. EV3 is not NXT, it's a completely different line. See this post on the Mindboards forums and all following posts for more info – shea Jan 19 '13 at 21:36
@Ambo100 I'm not sure the numbers are incremental in that way - NXT started back at "1" effectively after versions 1, 1.5 and 2.0 of Mindstorms Robotics Invention System, so the 3 really comes from the fact that it's the 3rd generation (RIS, NXT and now EV3). – Zhaph - Ben Duguid Jan 20 '13 at 0:29

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