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The LaTeX command for lozenge (◊) is \lozenge — diamond / modal possibility.
\lozengeWrite \lozenge inside math mode — that is, between $…$ for inline math or in a \[ … \] / equation block for display math. This symbol needs the amssymb package, so add \usepackage{amssymb} to your preamble.
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Use \lozenge in math mode after adding \usepackage{amssymb} to your preamble. For example, $p \lozenge q$.
It comes from the amssymb package — add \usepackage{amssymb} to your preamble.