卜
ボク, うらな.う, うらない, うら, ぼくのと

divining, fortune-telling, divination or katakana to radical (no. 25)

JLPT0 G13 S0 F5000

A depiction of cracks spreading over shells/bones burnt in a divination rite → *divination*; *fortune-telling*.

[Full Kanji Etymology List]