The symbols represent the celestial bodies in our solar system: ☉︎ (Sun), ☿︎ (Mercury), ♀︎ (Venus), ♁︎ (Earth), ♂︎ (Mars), ♃︎ (Jupiter), ♄︎ (Saturn), ♅︎ (Uranus), ♆︎ (Neptune), ♇︎ (Pluto). The related grouping ☉︎☿︎♀︎, ♁︎♂︎, ♃︎♄︎♅︎♆︎♇︎ suggests a categorization by proximity or type, possibly inner planets and outer planets.