A dual is a pair or a grouping of two. "Dual" is also the name for many things:

• Dual is a brand name for Hifi equipment, mostly known for vinyl record players.
• Dual! is the name of an anime series, Dual! Parallel Trouble Adventure
• In some languages, in addition to the singular and plural numbers there is also a dual number, which is used when exactly two people or things are meant.
• A simultaneous application of a P type and N type fertilizer

See Also

dual (electronics), Duality