# slash (solidus)

The solidus (or slash, slant, shilling mark, or virgule) is a versatile symbol that has mathematical as well as textual functions.

**1. Using a Solidus in Fractions**

Use a solidus to express a quotient in text when you do not need to use a displayed equation.

lifetime by the expression 1/t = 1/t

_{B}+ 2 S/D.

Use a solidus in superscript and subscript fractions.

^{1/2}

**2. Using a Solidus in Text**

In text, use a solidus to indicate some junctions, interfaces, and components.

1-butyl acetate/acetic acid/water (3:1:1)

With abbreviated units of measurement, the solidus stands for "per."

^{2}

355 W/m

^{2}

But spell out "per" when you spell out the units of measurement.

a few cents per kilowatt-hour

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