The term ampersand is a corruption of and (&) per se and, which literally means "(the character) & by itself (is the word) and." The symbol & is derived from the ligature of ET or et, which is the Latin word for "and."
— Geoffrey Glaister, Glossary of the Book
Is that a Q before the 74?
Q74 refers to Alice "&"....
Interesting, the history of the ampersand:
The term ampersand is a corruption of and (&) per se and, which literally means "(the character) & by itself (is the word) and." The symbol & is derived from the ligature of ET or et, which is the Latin word for "and." — Geoffrey Glaister, Glossary of the Book