旬

This is the kanji for a 10 day period. Historically this was used in Japan rather than the 7 day week.

on readings:

kun readings:

- examples:

上旬	jōjun	first 10 days of a month
中旬	chūjun	second 10 days of a month (11th - 20th)
下旬	gejun	last 10 (or 11 or 8 or 9) days of a month (21st - end)

links:
Wiktionary
Japanese calander entry on Wikipedia
72 Seasons blog

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