The @ symbol was a near-forgotten character rescued by the first email

Before 1971, the @ sign was a relic. It lingered on typewriters and keyboards as a faded commercial shorthand, the “at” of old invoices meaning “at the rate of,” largely ignored in everyday writing. Then one engineer reached for it, and it became one of the most recognized symbols on Earth.

That engineer was Ray Tomlinson, working on ARPANET, the network that would grow into the internet. In 1971 he wrote the first program to send mail between people on different host computers, not just users sharing one machine. To make that work, he needed a way to write an address that named both the person and the distant machine they were on.

He needed a character that would never turn up inside a person’s username, or the address would be ambiguous. Scanning his keyboard, he landed on @. It was perfect: rarely used, so it couldn’t be confused with a name, and it already read aloud as “at,” turning user @ host into a plain-English phrase.

“It indicated that the user was ‘at’ some other host rather than being local.”

The choice stuck instantly and never loosened. Every email address since, billions upon billions of them, follows Tomlinson’s format. A character once drifting toward obsolescence was promoted, almost by accident, into the global emblem of digital communication.