You probably know it as a "slash" or "forward slash," or, if you're in the UK, a "stroke." But did you know this common symbol (/) has a lot of other names?
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VIRGULA
From the 13th - 17th centuries, it was known as a "virgula suspensiva," and functioned as a comma.. Used in this capacity, it can also be called a "virgule" or "virgil" (virgula is Latin for twig), or a "scratch comma."
SEPARATRIX
As it preceded the comma in language, so it preceded the decimal point in maths, where it was once known as a "separatrix." (Now a separatrix in math is something else, but in language a separatrix is still a forward slash, only as a proofreader's mark. Got it?)
OBLIQUE STROKE and SHILLING MARK
At one time, the slash was most commonly known as an "oblique stroke" (oblique describes a slanting line). A shortening of this term resulted in the British common term "stroke." In some Commonwealth countries it is also a currency symbol known as a "shilling mark."
REVERSE BACKSLASH?
In North America, the term "forward slash" appeared as "a retronym used... following the popularization of MS-DOS and other Microsoft operating systems, which use the backslash for paths in its file systems." You could also call it a "front slash" or, if you're feeling delightfully absurd, a "reverse backslash."
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And here you thought a line was the shortest distance between two points. ☺
British postage stamp, 1923