Knob
01
ノブ, ボタン
a circular rounded projection or protuberance
02
ノブ, 取っ手
a small, often rounded, handle that lets one open and close a door
03
柄頭, 玉
an ornament in the shape of a ball on the hilt of a sword or dagger
04
こぶ, 隆起
any thickened enlargement
