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The LaTeX command for lVert rVert is \lVert x \rVert (norm (amsmath preferred)).
\lVert x \rVertWrite \lVert x \rVert inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. This symbol needs the amsmath package, so add \usepackage{amsmath} to your preamble.
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Use \lVert x \rVert in math mode after adding \usepackage{amsmath} to your preamble. For example, $\lVert x \rVert$.
It comes from the amsmath package: add \usepackage{amsmath} to your preamble.