"these go to eleven"
Designed by Mr. Tufnel, this eleven sided die is a nonagonal prism (although he calls it the Nigelhedron). It is numbered 11 and 1 on the 9-sided ends, and with pips which add up to 2 through 10 on each pair of rectangular faces which land upwards. Probably not a fair die because the faces aren't all the same shape. But Nigel doesn't care about that. He only cares that it goes up to one more than a d10.
I designed this die because this specific design (with 11 landing positions) did not appear to be available anywhere. I found the following similar prism dice designs to be available:
Note: this d11 die is not to be used for lumbar punctures.
This product was made available on March 2nd, 2016 (the 32nd anniversary of the release of the film "This Is Spinal Tap"