The LaTeX command for natural (♮) is \natural.
\naturalWriting a paper? The table generator and the BibTeX cleaner are one click away, no account.
Write \natural inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
\natural 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.
\mathfrak{h}\mathfrak{n}\dagger\ddagger^\circ\sharp\flat\checkmark\maltese\clubsuit\diamondsuit\heartsuit\spadesuit\hbarMore math symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \natural in math mode; it needs no extra package. For example, $\natural$.
None: \natural is built into LaTeX, so no extra package is required.