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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. The parse test for dual number nouns is “can we use 'a pair of' as a quantifier"?.
English language learners may be reminded that they have two legs, so need a one trouser for each leg (and thus a pair of trousers). In other languages, the corresponding words may be singular.
The indefinite pronouns/adverbs, “both", "either" and "neither" are dual.