隻 means “counter for ships, one of a pair”

せき · seki

Also: vessels, fish, birds

On'yomi (Chinese reading)
セキ

JLPT N2 · Taught in secondary school · 10 strokes

The story

A hand (又) holding a single bird (隹): just one, where two birds in hand made 雙, today's 双. 隻 counts ships, as in 一隻 or 数隻, and means one of a pair: the game Sekiro takes its title from 隻狼, the one-armed wolf.

Used in 一隻 (isseki, one ship) and 数隻 (suuseki, several ships)

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