The LaTeX command for succ (≻) is \succ.
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Write \succ 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.
As a relation, \succ gets a thick space on each side, and a long inline formula may break after it. With unicode-math under XeLaTeX or LuaLaTeX, typing ≻ in a formula gives the same symbol.
$a \succ b$Open this example in the live preview: it renders as you type, with no compiler and no signup.
\propto\perp\mid\nmid\parallel\nparallel\prec\preceq\succeq\subseteq\supseteq\subset\supset\subsetneqRelation symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \succ in math mode; it needs no extra package. For example, $a \succ b$.
None: \succ is built into LaTeX, so no extra package is required.