You aren't limited to just these. There are also ♇ Pluto, the asteroid belt minor planets (⚳ Ceres, ⚴ Pallas, ⚵ Juno, ⚶ Vesta, etc), heck, even the numbering of individual asteroids are technically stand-ins for symbols
edit: Link for funsies
You aren't limited to just these. There are also ♇ Pluto, the asteroid belt minor planets (⚳ Ceres, ⚴ Pallas, ⚵ Juno, ⚶ Vesta, etc), heck, even the numbering of individual asteroids are technically stand-ins for symbols
edit: Link for funsies