Duo or 2 in Latin
The number 2 translates to the word duo. The Latin word 'duo' is often found in modern day use.
The definition of a duo is a musical composition for two performers. The word is also used to describe a pair who associate with one another, especially in a comedy duo such as Laurel and Hardy.
A duet derives from this word meaning a composition for two performers.
It can also refer to two separate items of the same kind.