the one with cross on top of circle came from stylized globus cruciger
(Latin, "cross-bearing orb").
globus cruciger
The globus cruciger (Latin, "cross-bearing orb"), aka
orb and cross, is a Christian symbol of authority since the
Middle Ages, used on coins, in iconography, and with the sceptre as royal
regalia.
Today, Pluto โ is no longer considered a planet, but a dwarf planet, alone with other dwarf planets discovered recently.
One of them is dwarf planet Eris, but it doesn't have agreed-upon sign, and no Unicode symbol dedicated to it.
(Eris is goddess of strife.
She tossed a golden apple with inscription "for the most beautiful" in the midst of the feast of the gods at the wedding of Peleus and Thetis as a prize of beauty, thus sparking a vanity-fueled dispute among goddesses Hera, Athena, and Aphrodite that eventually led to the Trojan War.
)
BLACK MOON LILITH Symbol โ
The BLACK MOON LILITH โธ is a hypothetical moon proposed in 1918 by astrologer Walter Gorn Old.
It's not recognized in astronomy today or in the past.
Though, there is a asteroid named 1181 Lilith.
Lilith is a figure in Jewish mythology, a "night monster".
