<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.

The absolute value of a number, also known as its cosign, is its distance from zero regardless of direction. It shouldn't be negative, but Sgeo is trying to break maths.