指
シ, ゆび, さ.す, さ.し, い, いぶ, さし, さす

finger, point to, indicate, put into, play (chess), measure (ruler)

JLPT3 G3 S9 F155

As per 旨# (ladle) + 手 hand/action indicator → *point to* or *indicate* something with a long, thin object such as a ladle or a *finger* (compare 將) → *designate*; *name*; (in shogi/chess etc.) (make a) *move*. Also, *head for* (← head for a designated point).

[Full Kanji Etymology List]