From
Pure Logic by William Stanley Jevons, 1864. The text reads, "Let it be borne in mind that the letters A, B, C, &c., as well as the marks +, 0, and =, afterwards to be introduced, are in no way mysterious symbols." However, we found some rather mysterious meanings of A, B, C for our
One-Letter Words: A Dictionary, and some even more mysterious meanings of &c for our book entitled
Ampersand.