⊕ and ♁ are the astronomical symbols representing the planet Earth.
But astrology and traditional symbolism owe their inspiration not to the Copernican system but to that which had been accepted by the Ancients. <...> At the same time, the fact of there being seven planets responds to the idea of the seven planetary heavens, which in turn tallies with that of the seven Directions or areas in space (which in turn, when transposed into terms of time, becomes the origin of the seven days of the week). The relationship of the planets to the seven points in space is as follows: Sun — the zenith, Moon — the nadir, Mercury — the centre, Venus — the West, Mars — the South, Jupiter — the East, and Saturn — the North.One of symbols for Earth is a cross in a circle ⊕ which could be thought of as a globe with equator and one meridian.
Another symbol is a stylised globus cruciger, ♁, which looks like the upside-down “mirror of Venus” ♀, or maybe it is just ⊕ where the cross went off-centre. Note its (unintentional) similarity with Chinese character 土 “earth”. ♁ is also an alchemical symbol for antimony.
Earth deities include goddesses Cel, Cybele, Demeter, Gaia, Jörð, Ki, Māra, Mat Zemlya (Мать-Сыра Земля), Mokoš (Мокошь), Pachamama, Papahānaumoku, Sif, Terra (Tellus), Urash and Žemyna as well as gods Geb, Tudigong and Veles.