The LaTeX command for slash (/) is \slash.
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Write \slash in normal text, outside math mode. It is part of core LaTeX, so no extra package is required.
\slash is a text command: inside a formula it needs \text{...} from amsmath. With XeLaTeX or LuaLaTeX you can also type / directly.
Open this example in the live preview: it renders as you type, with no compiler and no signup.
\dots-----\textasciitilde\textasciicircum\textbackslash\textasteriskcentered``''\textcopyright\textregistered\texttrademark\pounds\texteuroText symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \slash in normal text; it needs no extra package. For example, \slash.
None: \slash is built into LaTeX, so no extra package is required.