From Latin viginti, twenty. This is an excessively large number, which mathematicians write 1E120, base 10 with exponent 120, 10 to 120 power, that is, a 1 followed by 120 zeros. To approach imaginary, it is much more than the atoms contained in our universe that are estimated at 1E80, 10 to 80 power, a 1 followed by 80 zeros, one hundred tredecillons. A tredeillon is a 1 followed by 78 zeros. These numbers are not recorded in dictionaries because they are only used by mathematicians in their speculations.