I know that \ell gives me this nice mathematical "calligraphic" letter l, which I want to use throughout my document. However, it is also a common typographic convention that vectors are typeset in boldface as opposed to having a little arrow on top of them.

Hence: How do I get a boldface \ell? Simply enclosing it in \mathbf does not work...


You can use \boldsymbol from the amsbsy package; if you are going to use the symbol very often, then you can define a new command, as in the following example:





  • 1
    Two remarks: \ensuremath serves no purpose here; and bm is recommended over amsbsy; it provides \boldsymbol as an alias to \bm (it should be loaded after amsmath). – egreg Jul 23 '17 at 14:39



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I could only get it to work using:


  • 2
    \pmb is not needed: \bm{\ell} does the job. – egreg Jul 23 '17 at 14:37

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