ద్వంద్వము

Etymology
From.

Noun

 * 1) A pair or couple.
 * 2) A duel.
 * 3)  The name of a certain kind of compound word in which two nouns if uncompounded would be in the same case and united by a conjunction. ex: రామలక్ష్మణులు (Rama and Lakshmana).