I've been unable to find this specific piece's name, just for the reason that it is a very unorthodox piece.
Informally, it's known as the Nexogon.
Bricklink calls it "Plate, Modified 6 x 6 Hexagonal with Pin Hole". The part number is 27255. It's original use was as a shield in the Nexo Knights line in 2017, but it has appeared in a few other sets since then.
If you're interested in ways to use this part, New Elementary did a whole series of posts from different builders when it was first released. The unique shape and different connection families open up a lot of fun opportunities.
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1Is there any name for that type of irregular hexagon? I couldn't find any in MathWorld. Also, here's more fan stuff on Nexogon:brothers-brick.com/2017/01/19/… – smci Dec 2 '17 at 4:59
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1@smci: You can see this hexagon as a truncated equilateral triangle. – Eric Duminil Dec 2 '17 at 10:28
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Thank you so much! I have been having such a hard time trying to identify this piece, but you made my job so much easier. Thanks again! – Unorthodox Paradox Dec 4 '17 at 14:44
This is what I managed to create with the Nexogons:
Flickr Album: https://www.flickr.com/photos/162108633@N02/albums/72157688876724660
answered Sep 11 '18 at 20:53
