The LaTeX command for top (⊤) is \top (true / tautology).
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Write \top 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.
\top keeps its spacing inside a formula; for a word such as "and" in the middle of one, use \text{ and } from amsmath. With unicode-math under XeLaTeX or LuaLaTeX, typing ⊤ in a formula gives the same symbol.
$p \top q$Open this example in the live preview: it renders as you type, with no compiler and no signup.
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Use \top in math mode; it needs no extra package. For example, $p \top q$.
None: \top is built into LaTeX, so no extra package is required.