斗
ト, トウ, ます, とます

Big Dipper, 10 sho (vol), sake dipper, dots and cross radical (no. 68)

JLPT1 G7 S4 F1885

A depiction of a curved *ladle* or *dipper* → *measuring cup* → *unit of liquid measure* (about 18 liters).

[Full Kanji Etymology List]