Where did And Per Se come from?
The ampersand, also known as the and sign, is a logogram representing the conjunction “and”. It originated as a ligature of the letters et—Latin for “and”.
Traditionally, when reciting the alphabet in English-speaking schools it was common practice to add the & sign at the end of the alphabet as if it were the 27th letter, pronounced as the Latin et or later in English as and. As a result, the recitation of the alphabet would end in “X, Y, Z, and per se and”. This last phrase was routinely slurred to “ampersand” and the term had entered common English usage by 1837.