Yottaton vs. Septillion — What's the Difference?

A measure of the strength of an explosion or a bomb, based on how many septillion tons of TNT would be needed to produce the same energy.

The cardinal number equal to 1024.

Chiefly British The cardinal number equal to 1042.

A trillion trillion: 1 followed by 24 zeros, 10²⁴.

A billion quintillion: 1 followed by 42 zeros, 10⁴².

According to the French method of numeration (which is followed also in the United States), the number expressed by a unit with twenty-four ciphers annexed. According to the English method, the number expressed by a unit with forty-two ciphers annexed. See Numeration.