Not all of the gods has symbols the way we think. Phobos was a personification more than an actual god. There are no myths with Phobos, and no temples dedicated to him.
No symbol.
The Greek goddess Hestia's symbol was the pig and the house.
the greek god bu-tugly is the god of the spider web.
The Greek goddess, Demeter.
The Greek God Dionysus. He is the God of wine.
Hephaestus the god of metalwork
First Cronus is a titan not a god secondly his symbol is a scythe
the symbol of the greek god Poseidon is Trident ,dolphins, horses.
Theseus wasn't a Greek god, so had no official symbols.
The symbol of Gaia is the Earth, which she personifies in Greek myth.
the symbol for Zues in lighting bolt
It's said that her symbol was a butterfly.