1
\ell 

corresponds to

enter image description here

Is there a symbol corresponding to uppercase \ell?

4
  • 1
    $\mathcal{L}$ perhaps?
    – user31729
    Feb 19, 2017 at 21:28
  • \mathcal works.
    – Viesturs
    Feb 19, 2017 at 21:35
  • 1
    The point of \ell is to use that letter rather than the (easily) indistinguishable lowercase l. In the case of the uppercase L there's no confussion so there's no need to use a different glyph. You might be looking for the \mathcal or \mathscr alphabets, but I just wanted to point that out. If you are writting a normal uppercase ell, there's no need for a special glyph like there is for the lowercase one.
    – Manuel
    Feb 19, 2017 at 22:12
  • 1
    I guess this question comes from the IEEE standard 1139-1999 which defines phase noise and make note on used symbol as "script ell". However I have already seen pound sign used in rather classy texts. I would use \mathcal{L} with "calrsfs" package as already suggested for this purpose and other \mathcal{L} use would be reserved for linear operators or Laplace transform.
    – struct
    Jul 14, 2019 at 10:47

1 Answer 1

3

You can use either the amssymb package or the mathrsfs package. If you decide to use amssymb use this to typeset a "curly" L:

\mathcal{L}

If you decide to use mathrsfs, you use:

\mathscr{L}

Regardless of your choice, I recommend that you include

\newcommand{\Lagr}{\mathcal{L}}

In your preamble, so that you can easily switch all instances of the curly L if you decide you don't like the one you chose.

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