W, X, Y, Z, and per se and” to clarify that “and” referred to a list item rather than serving as a conjunction for an item that was left unuttered. The symbol comes from the cursive formation of the Latin word et (“and”), and the name is a slurring contraction of “and per se and,” which used to terminate schoolroom recitals of the alphabet: The phrase means “and by itself and” instead of reciting, “. The ampersand was, at least until well into the nineteenth century, treated as the twenty-seventh letter of the alphabet, but its star has fallen, so that now it is used only informally except in registered names of businesses (“Ay, Bee & See Inc.”), which should be written as rendered a comma preceding it is extraneous. What is the origin of various symbols used in English, and when is the use of each appropriate? Here’s a guide to twelve common signs, including how they developed and in which contexts they are used or avoided.
12 Signs and Symbols You Should Know By Mark Nichol