極
キョク, ゴク, きわ.める, きわ.まる, きわ.まり, きわ.み, き.める, ぎ.め, き.まる

poles, settlement, conclusion, end, highest rank, electric poles, very, extremely, most, highly, 10**48

JLPT2 G4 S12 F460

As per 亟# (stretch to full height/length) + 木 tree/wood → wooden pillar stretching between ceiling and floor → *extreme*; (positive/negative) *pole*; *end*. Also, *exhaust* (← exhaust/come to the end of one's resources).

[Full Kanji Etymology List]