The LaTeX command for prec (≺) is \prec.
\precWriting a paper? The table generator and the BibTeX cleaner are one click away, no account.
Write \prec 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, \prec 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.
$a \prec b$Open this example in the live preview: it renders as you type, with no compiler and no signup.
Relation symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \prec in math mode; it needs no extra package. For example, $a \prec b$.
None: \prec is built into LaTeX, so no extra package is required.