the Big Dipper, the Plough

The Japanese festival for children; a traditional rite of passage and festival day in Japan for three- and seven-year-old girls and three- and five-year-old boys, held annually on November 15. As Shichigosan is not a national holiday, it is generally observed on the nearest weekend. Similar to こどもの日 (Kodomo no Hi, literally “Children's Day”)

three-quarter sleeves

a blotchy swellshark

a heptadecagon

biblical seventh day (of creation, of the Jewish week) / the seventh day (of the month, week, year, etc.)

twenty-seven; 27

thirty-seven; 37

seventeenth day of the month

(mahjong) a 役 (yaku, “hand”) of seven pairs, worth 2 翻 (han, “doubles”)