beanbags; jackstones; cueball
Refers to small objects used in traditional children's games, such as beanbags for juggling or jackstones. Also used in the idiom 手玉に取る (to lead someone around by the nose).
When I was a child, I often played with beanbags.
She has him wrapped around her little finger.
Compound of 手 (hand) and 玉 (ball). The exact origin is uncertain, but it likely refers to small balls or beanbags held in the hand for play.