The LaTeX command for measuredangle (∡) is \measuredangle.
\measuredangleWriting a paper? The table generator and the BibTeX cleaner are one click away, no account.
Write \measuredangle inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
\measuredangle is a math-mode symbol: in running text, wrap it in $...$. With unicode-math under XeLaTeX or LuaLaTeX, typing ∡ in a formula gives the same symbol.
Open this example in the live preview: it renders as you type, with no compiler and no signup.
More math symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \measuredangle in math mode after adding \usepackage{amssymb} to your preamble. For example, $\measuredangle$.
It comes from the amssymb package: add \usepackage{amssymb} to your preamble.