叉
サ, シャ, サイ, また

fork in road, crotch

JLPT0 G13 S0 F5000

The relevant seal inscription form is an abbreviated form# of 爪 (pick/pluck) + an object → stab at an object with a forked implement to *catch* or *sandwich* it → *fork* (in the road); (Edo-era) *Y-shaped weapon for apprehending criminals*.

[Full Kanji Etymology List]