means A quark is one of the elementary particles that combine to form protons, neutrons, and other particles, never found alone but always bound together inside them.

from Coined by physicist Murray Gell-Mann in the 1960s, who first had the sound in his head and only later found the spelling — borrowing the word from James Joyce's *Finnegans Wake*, where the line "Three quarks for Muster Mark!" caught his ear, conveniently matching the way quarks come in threes inside a proton. Joyce's own "quark" was likely a nonsense rhyme, possibly playing on a German word for a kind of soft curd cheese — so a particle at the heart of all matter is named, at the end of the chain, after a literary joke and maybe some dairy.