6-2-1 rule

Alternative forms

 * 621 rule

Etymology
From the numerical quantities of the three stipulations of the 6-2-1 rule.

Proper noun

 * 1)  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.

Usage notes

 * Unrelated to, a euphemism within furry fandom slang for the pornographic furry art website e621.net. This term predates the website.