Trillian - Definition and Overview

Trillian may refer to:

• Trillian, a fictional character in The Hitchhiker's Guide to the Galaxy
• Trillian, an instant messaging application named after the above mentioned fictional character.

Trillian is also a common misspelling for Trillion, a very large number. In the United States, it represents <math>10^{12}<math> (written out: 1,000,000,000,000) and is equal to one million times one million. In Europe, it represents <math>10^{18}<math>.