ハン, バン, わか.る
judgement, signature, stamp, seal
JLPT3 G5 S7 F197
As per 半# (split) + 刀 sword/knife → judgment likened to a decisive cutting in two (compare 斷, 裁, 決 and 折) → *judge* → *seal* (of judgment); *size* (← seal of a particular size).
[Full Kanji Etymology List]