🔢NaN
not a number.
JS ⟩ scope ⟩ global ⟩ global object ⟩ property ⟩ NaN
( non-configurable, non-writable global object property )❗
a property of the global object. (that is, a variable in global scope).
equivalent to Number.NaN.
NaN
is the only value that doesn't equal to itself❗
trichotomy law: a < b, a = b, a > b
doesn't apply to NaN❗
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