Answer by barbara beeton for Importing a single letter from Euler cursive font
the symbol you are looking for is \ell, which is included in the basic computer modern font.it can be found using detexify, as suggested in the questionHow to look up a symbol or identify a math...
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Using the standart Computer Modern font how can I redefine the letter "l" (which looks like a 1 "one" ) with a different more curly font but keep the math font otherwise...
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