Before its ascent to accidental stardom, the ‘@’ went almost unremarked for centuries. Widely used to mean ‘at the rate of’1 — for example, ‘3 apples @ $1 each’ — the symbol lived out a useful but mundane existence in the world of commerce, rarely warranting a second glance from paleographers or philologists. Even now, when it has been propelled firmly into the limelight by email’s meteoric rise, credible accounts of the symbol’s visual appearance and meaning remain surprisingly thin on the ground.
Like the ampersand, the ‘@’ symbol is not strictly a mark of punctuation; rather, it is a logogram or grammalogue, a shorthand for the word ‘at’. Even so, it is as much a staple of modern communication as the semicolon or exclamation mark, punctuating email addresses and announcing Twitter usernames. Unlike the ampersand, though, whose journey to the top took two millennia of steady perseverance, the at symbol’s current fame is quite accidental. It can, in fact, be traced to the single stroke of a key made almost exactly four decades ago.