The ubiquitous symbol of the elephant in Indo-Greek coinage may also have been associated with Buddhism, as suggested by the parallel between coins of Antialcidas and Menander II, where the elephant in the coins of Antialcidas holds the same relationship to Zeus and Nike as the Buddhist wheel on the coins of Menander II. When the Zoroastrian Indo-Parthian Kingdom invaded North India in the 1st century AD, they adopted a large part of the symbolism of Indo-Greek coinage, but refrained from ever using the elephant, suggesting that its meaning was not merely geographical.