The LaTeX command for ll (≪) is \ll (much less than).
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Write \ll 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, \ll 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.
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Relation symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \ll in math mode; it needs no extra package. For example, $a \ll b$.
None: \ll is built into LaTeX, so no extra package is required.