the Pleiades
昴 refers specifically to the Pleiades star cluster, a group of stars in the constellation Taurus. It is a specialized astronomical name with no broader abstract meaning.
昴 combines 日 (sun) with 卯, which likely acts as a phonetic component. The character was created to name the Pleiades star cluster, but the exact historical reasoning behind the component choice is uncertain.
The sun 日 sits above 卯, like a bright celestial marker. Picture the Pleiades as a tight group of suns clustered together in the night sky.
For コウ, imagine a group of stars forming the shape of a glowing coal in the sky: coal -> コウ, and the Pleiades burn like embers.
Chinese "Hairy Head" constellation (one of the 28 mansions); Pleiades; Seven Sisters
Pleiades (esp. in winter)
Chinese "Hairy Head" constellation (one of the 28 mansions); Pleiades; Seven Sisters
Chinese "Hairy Head" constellation (one of the 28 mansions); Pleiades; Seven Sisters