E-mail symbol. Abstract computer illustration of an '@' (meaning insatins) sign on a human fingerprint, depicting the individual nature of an electronic mail (e-mail) address. '@' is a symbol used in all e-mail addresses. Each e-mail address is unique throughout the world. This means that one can be contacted via e-mail, anywhere in the world providing the sender has one's email address. E-mail is part of the internet, a global network of computers able to send and receive information between themselves.