Dual number

From Teflpedia

Dual number is a grammatical number equal to 2. It's marginally present in English as a vestige. Generally these are treated as a type of plural.

Examples include "scissors", "pants", "trousers", etc. A "pair of", or a "couple of" can be used as quantifiers.

In British English, this usually takes a plural verb agreement, e.g. "the couple are married", whereas in American English this tends to be "the couple is married". In this regard, the treatment is the same as collective nouns.

The indefinite pronouns, "both", "either" and "neither" are dual.