乙 means “second, B, stylish”

おつ · otsu

Also: the latter, duplicate, strange, witty

Kun'yomi (Japanese reading)
おと-, きのと
On'yomi (Chinese reading)
オツ, イツ

JLPT N1 · Taught in secondary school · 1 stroke

The story

A single bent stroke, a fishhook shape: the second of the ten stems, so B after 甲's A. Contracts call the parties 甲 and 乙, 甲乙つけがたい is too close to rank, and something 乙な is quietly stylish.

Used in 甲乙 (kouotsu, A and B/relative merit), 乙女 (otome, maiden), and 乙な (otsu na, chic/stylish)

More from Old Measures

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.