More than just the d100 he was a pioneer of being very exacting when it came to making polyhedral dice. See http://www.1000d4.com/2013/02/14/how-true-are-your-d20s/
https://en.wikipedia.org/wiki/Zocchihedron
I didn't see a picture of Zocchi's d100, Wikipedia has one
I've never played any games that require this, but the Wikipedia page makes reference to percentage rolls, but wouldn't you need 101 sides to get 0% and 100% for that?
I just throw 17d6 and subtract 2.
Problem solved.
(I am joking!)
The amount of games that use those kinds of dice make his contribution to tabletop gaming incommensurable. Sad to see him passing. But 91 yo is more than respectable