arc, arch, bow
弧 centers on a curved shape: an arc, an arch, or a bow. The common thread is a smooth, bent line.
弧 combines 弓 (bow) with 瓜, which likely contributes the sound. The character expresses the curved shape of a bow.
A bow 弓 beside a melon 瓜: imagine a curved melon slice shaped like an archer's bow, making an arc.
For コ, picture a small child (子, こ) drawing an arc with a bow: 子 -> コ, and the bow makes the curved line.
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brackets; parentheses
superior (major) arc
arc
arc
arc shape; crescent shape
less-than mark; left angle bracket
square brackets; Japanese-style quotation marks
curly braces; curly brackets
parentheses; round brackets
tortoiseshell bracket (punctuation mark)
minor arc
excitation
closing brace
closing bracket
closing parenthesis
square brackets
parentheses; parenthesis; (round) brackets
angle bracket (punctuation); chevron
island arc; crescent-shaped archipelago
opening brace