Etymology

6-2-1 rule

6·2·1 rule

Today it means: A guideline for hygienic and healthy conduct while attending a multi-day convention, stipulating at minimum six hours of sleep per night, two meals per day, and one shower every day. Full definition →

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The story

From the numerical quantities of the three stipulations of the 6-2-1 rule. Popularised by the furry fandom, and in use since as early as 8 November 1998 (see quotations); despite multiple claims suggesting that the 6-2-1 rule was devised by a physician or other doctor, and that it potentially originated in the science fiction community, this is unverified.

Etymology from Wiktionary, CC BY-SA 4.0.