零 0 ০ ०
is a separate and special entity called 'Identity element'. 0 is actually the identity element under addition for the real numbers, since if a is any real number, a + 0 = 0 + a = a. Mathematicians refers to 0 as the additive identity (or better said, the reflexive identity of addition).
is considered to be a purely imaginary number: 0 is the only complex number which is both real and purely imaginary.
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