Symbols:F

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femto-

$\mathrm f$

The Système Internationale d'Unités symbol for the metric scaling prefix femto, denoting $10^{\, -15 }$, is $\mathrm { f }$.

Its $\LaTeX$ code is \mathrm {f} .

Hexadecimal

$\mathrm F$ or $\mathrm f$

The hexadecimal digit $15$.

Its $\LaTeX$ code is \mathrm F  or \mathrm f.

Function

$\map f x$

The letter $f$, along with $g$ and $h$, is frequently used to denote a general mapping or function, in particular a real function.

The $\LaTeX$ code for \(\map f x\) is \map f x .