Gillion
Gillion is a word that can refer to a unit of currency or a measure of quantity, depending on the context. In some fictional settings, a gillion might be a fictional currency used for trade and commerce. It could represent a significant amount of wealth, akin to a million or a billion in real-world terms. The specific value and purchasing power of a gillion would be determined by the creator of the fictional world.
Alternatively, "gillion" can be used informally as a hyperbolic term to denote a very large, unspecific number.