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

• For several meanings of "dual" in mathematics, see duality (mathematics)
• 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 dual troll or secondary account on a message board for a number of typically neferious purposes used for internet trolls
• A simultaneous application of a P-type and N-type fertilizer
• Diffusing update algorithm (DUAL) is a component of the routing-protocol EIGRP for route calculation
• 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

See also

• dual (electronics)
• dual wavelet
• duality
• duality (mathematics) and the use of dual in boolean algebra

Dual | Dual | Dual