Question

this is the sign of a​

Answer 1

Explanation:

sign of aggregation. noun phrase. : any of various conventional devices ( such as braces, brackets, parentheses, or vinculums) used in mathematics to indicate that two or more terms are to be treated as one quantity.

In 1972, Ray Tomlinson sent the first electronic message, now known as e-mail, using the @ symbol to indicate the location of the e-mail recipient. In 1972, Ray Tomlinson sent the first electronic message, now known as email, using the @ symbol to indicate the location or institution of the email recipient.