The LaTeX command for mathfrak h (๐ฅ) is \mathfrak{h}.
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Write \mathfrak{h} inside math mode, that is between $โฆ$ for inline math or in a \[ โฆ \] or equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
\mathfrak{h} is a math-mode symbol: in running text, wrap it in $...$. With unicode-math under XeLaTeX or LuaLaTeX, typing ๐ฅ in a formula gives the same symbol.
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\mathcal{P}\mathcal{R}\mathcal{S}\mathcal{T}\mathcal{X}\mathscr{A}\mathfrak{g}\mathfrak{n}\dagger\ddagger^\circ\sharp\flat\naturalMore math symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \mathfrak{h} in math mode after adding \usepackage{amssymb} to your preamble. For example, $\mathfrak{h}$.
It comes from the amssymb package: add \usepackage{amssymb} to your preamble.