I have this as a tattoo to represent my partner, with some subtle colour added. Just found out it is originally an embroidery design from "Make your next crafty move a good one with this chess-themed design! Dynamic strokes make up a stylized knight.
From Mario Bettini’s Aerarium Philosophiae Mathematicae [Treasury of Mathematics], published in Bettini - was a Jesuit, a mathematician and an astronomer. The book is an encyclopedic collection of mathematical curiosities.