The LaTeX command for angstrom (Å) is \text{\AA} (angstrom (length unit)).
\text{\AA}Writing a paper? The table generator and the BibTeX cleaner are one click away, no account.
Write \text{\AA} inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. This symbol needs the amsmath package, so add \usepackage{amsmath} to your preamble.
The physics and siunitx packages offer shortcuts for many formulas, but \text{\AA} works in plain LaTeX. With unicode-math under XeLaTeX or LuaLaTeX, typing Å in a formula gives the same symbol.
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\partial\dot{x}\ddot{x}\langle \psi || \psi \rangle\langle \phi | \psi \rangle\rightleftharpoons^\circ\mathrm{C}\infty\dagger\hbar\nabla\nabla^2\nabla \cdotPhysics symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \text{\AA} in math mode after adding \usepackage{amsmath} to your preamble. For example, $\text{\AA}$.
It comes from the amsmath package: add \usepackage{amsmath} to your preamble.