Octet

An octet is a group consisting of eight (8) elements. It has several specific meanings:

octet (Roman legion), the smallest unit within a Roman legion, consisting of eight soldiers with two non-combatant "servants" (actually support troops) attached
Octet (music), a musical ensemble consisting of eight instruments
Octet (computing), a group of 8 bits
Octet rule, a simple chemical theory that states that atoms tend to combine so they each have eight electrons

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