The story
Named after Nicola Cabibbo, Makoto Kobayashi, and Toshihide Maskawa.
Etymology from Wiktionary, CC BY-SA 4.0.
Cabibbo-Kobayashi-Maskawa matrix
Today it means: In the Standard Model, a unitary matrix that specifies the mismatch of quantum states of quarks when they propagate freely and when they take part in the weak interactions. It is important in the understanding of CP violation. Full definition →