⯔

Alternative forms
For Pluto, the orb may be as large as those of the other planetary symbols $⟨⟩$, $⟨⟩$, $⟨⟩$, $⟨⟩$ and German-style $⟨⟩$. There may be no globe at all in German sources that use a globeless $⟨⟩$ for Neptune.

Etymology
For Astraea, this is an inverted anchor, 🝸, presumably a typographic substitute for the mythologically associated set of scales, and dates to 1849.

It's not known if the Pluto symbol is related. It has been in use since at least 1950 without an orb and 1969 with an orb.

Symbol

 * 1)  asteroid (5) Astraea.
 * 1)  asteroid (5) Astraea.

Synonyms

 * [1] ⯓, ⯖
 * [2] (astrology) &