<b_jonas> slashlearn euclid//Euclid is a short geeky game in which the goal is to do Euclidean compass and straightedge constructions in as few steps as possible. It runs in the browser, found at "http://www.euclidthegame.com/". It was popular among #esoteric regulars in 2016-07.

Coptology is comprised of coptanalysis and coptography. Coptanalysis is concerned with the disassembly and reverse engineering of copters, whereas coptography is the art of designing and engineering copters that are robust against coptanalysis.