The LaTeX command for ddagger text (‡) is \ddag.
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Write \ddag in normal text, outside math mode. It is part of core LaTeX, so no extra package is required.
\ddag works both in running text and inside a formula. 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.
\textcopyright\textregistered\texttrademark\pounds\texteuro\textyen\dag\S\P\textbullet\dots-----\textasciitildeText symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \ddag in normal text; it needs no extra package. For example, \ddag.
None: \ddag is built into LaTeX, so no extra package is required.