What character was once considered to be the 27th letter of the alphabet?

The character that was once considered to be the 27th letter of the alphabet is the Ampersand. Originally, the Ampersand symbol "&" was included as the final letter of the English alphabet in the late 18th century and early 19th century. Its name, "ampersand," is derived from the phrase "and per se and," which means "and by itself is 'and'" in Latin. However, over time, it was removed from the alphabet, and now it is recognized as a symbol rather than a letter, commonly used to represent the conjunction "and" in modern writing and typographic design.