宿
㝛sù
#1,750 most
frequent character
old variant of 宿[su4]
Character breakdown
Source: Make Me a Hanzi.
宿 shows a person inside a building, lying on a bamboo mat. That gave the first meaning, 'resting on a mat,' which grew to 'stay overnight' and then a measure word for nights. The constellation sense was borrowed for its sound, not from the picture.
Drawn as: person in building; bamboo mat
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