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The arrangement of spikes originally had no distinct name; the term Thagomizer was coined in 1982 by cartoonist Gary Larson in his comic The Far Side, and thereafter became gradually adopted as an informal term within scientific circles, research, and education.
thagomizer (plural thagomizers) An arrangement of spikes found on the tails of various stegosaurs. 2001, Holtz, Thomas R.; Riley, Terry, The Little Giant Book of Dinosaurs, page 54: Like the thagomizer of the stegosaur, the ankylosaurid tail club was probably used to smash into attackers.