The story
Named after German mathematician Christian Felix Klein (1849—1925). The concept arose from Klein's Erlangen program (published 1872).
Etymology from Wiktionary, CC BY-SA 4.0.
Klein geometry
Today it means: A type of geometry (mathematical object representing a space and its spatial relationships); a homogeneous space X together with a symmetry group which represents the group action on X of some Lie group; Full definition →