Why is the letter m used for slope in equations?This question has been researched by math historians but has not yet been answered definitively.Many people have been taught that m comes from the French monter, to climb, but this appears to be an 'urban legend.' Although m can stand for "modulus of slope" and the term "modulus" has often been used for "the essential parameter determining," there is no definitive proof that this is the derivation of m. M. Risi, the author of math textbooks written in French for students of Quebec province, says that in his system, "the first letters of the alphabet, a, b, c... represent the constants, the last letters, x, y, z, represent the unknown variables, and the middle letters, m, n, p... represent the parameters." When he started to explain slope, it was in studying the first degree equation: y = mx + b. X and y were the variables, b was fixed and considered as a constant, and was appended to the coefficient of x as its value variedso it was a parameter, and that is why m was selected. Prof. John Conway points out, however, that M. Risi was not the first person to use 'm' to represent slope. Thus the jury is still out on this question. Jeff Miller summarizes:
What do you call the "fraction bar"?There was quite a lengthy discussion of this on a History of Math mailing list. Different people and nationalities use different terms (variety is the spice of life).The word solidus is used for the symbol "/" in any context. It doesn't have to be part of a fraction as in 1/2. The solidus is also called a virgule,  the two words can be used interchangeably. When the line isn't slanted, but looks like this:
a it's called a vinculum (binding). Originally a vinculum was a horizontal bar placed over two or more terms in order to indicate grouping, but according to The Words of Mathematics, An Etymological Dictionary of Mathematical Terms Used in English, by Steven Schwartzman, "some recent authors have extended the definition of vinculum to include the bar between the numerator and the denominator of a fraction, given that the fraction bar often acts as a grouping symbol." In addition to The Words of Mathematics, Steven Schwartzman, MAA 1994, see A History of Mathematical Notation, Florian Cajori, Dover.
Tim Kurtz, formerly of St. Bonaventure University, whose service "Ask Professor Maths" provided the initial inspiration for Ask Dr. Math, adds: The virgule or solidus is also used in the following ways:
alternatives and/or

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