+**2ea** (short for "two each") signifies a precise quantity of two units. It forms a fundamental concept in [Counting](/wiki/Counting), often representing a pair or a dual state. This simple measure underpins many systems, from basic enumeration to complex [Mathematics](/wiki/Mathematics).
+## See also
+- [Number](/wiki/Number)
+- [Pair](/wiki/Pair)
+- [Duality](/wiki/Duality)
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