You searched for: “grammalogue
Shorthand; a word represented by a single sign; also, a letter or character representing a word (more correctly called a logogram). Examples of grammalogues include: &, #, ©, ®, ¶, and @.

Although & is called an ampersand (meaning "and"), there is also a new symbol which is called a questpersand which is pronounced: "and?"

questpersand symbol
—Source: Verbatim, The Language Quarterly, Essex, Connecticut, 1977, page 536.