⯔

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.[1]

For Astraea, this is an inverted anchor, 🝸, presumably a typographic substitute for the mythologically associated set of scales, and dates to 1849.[2]

It's not known if the Pluto symbol is related. It has been in use since at least 1950 without an orb[3] and 1969 with an orb.[4]

⯔

1. (astrology) a southern continental European symbol for Pluto, commonly used in Spain, France, Italy and Germany.[1]
2. (astronomy, obsolete) asteroid (5) Astraea.

[1] ⯓, ⯖

[2] (astrology) ⯙

• 
  Orbless variant of the Pluto symbol
• 
  Large-orbed variant of the Pluto symbol