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The LaTeX command for triangleq (≜) is \triangleq — defined as / triangle over equals.
\triangleqWrite \triangleq inside math mode — that is, between $…$ for inline math or in a \[ … \] / equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
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Use \triangleq in math mode after adding \usepackage{amssymb} to your preamble. For example, $a \triangleq b$.
It comes from the amssymb package — add \usepackage{amssymb} to your preamble.