ceremony, law, rule

a female given name

the mon, an old currency / a unit of length for measuring the size of one's foot (from the way that the mon coins would be lined up and used as a kind of inch marker) / a character, a letter

single

one

千早人: allusion to 宇治 (Uji, “a placename, especially of a river crossing”)

those who know, know

(idiomatic, proverb) be quick on the uptake, understand the whole situation from just a few clues

ox, bull / special, exceptional, extraordinary / especially

三角定規: set square