Lord Ganesha’s belly represents the whole cosmos, the seven realms above and below and the seven oceans are inside Ganesha’s cosmic belly. These are held together by the cosmic energy (kundalini) symbolized by the huge snake around him.

What are Ganesha's symbols?

GaneshaWeaponParaśu (axe), pāśa (noose), aṅkuśa (elephant goad)SymbolsSwastika, Om, ModakMountMouseTextsGanesha Purana, Mudgala Purana, Ganapati Atharvashirsa

Why does Ganesha ride a mouse?

According to Ganesha Purana, there was a celestial musician-god named Krauncha. He accidentally stepped on the foot of Muni Vamadeva who cursed him to become a mouse. … The giant mouse damaged everything that came in its path. The prophecy was fulfilled when the mouse became the vahana of Ganesha.