A mononymous person is an individual who is known and addressed by a single name, or mononym.
N1CK is alway N1CK and never Nick.
If you do a Google search for Nick you will get About 1,430,000,000 results.
If you search N1CK you will find N1CK and About 720,000 results
The 1 (one) is always written in serif font to ensure no confusion with an i.
Check out all the concert N1CK has attended (well all the ones there are tickets for and he remembers)