Gugor: 100 to the power of 100 (10/0, followed by 100 zeros). Gugor is equal to:10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000.

The largest number, in the mathematical sense, was originally "∞". (Infinite)

A larger unit of counting: googolplex is 1 followed by googol zero, which was created by Milton Sirotti, nephew of American mathematician Edward Casner, and deduced by Casner.