initials

n. the first letters of your names, usually your first name and your family name.

n. the first letters of a person's given and family names, often used as a shorthand signature.

“He has his initials, J.S., sewn onto the pocket of his shirt.”

“The silver briefcase was engraved with the owner's initials in an elegant, italicised script that made it easy to identify at the airport.”

v. to write your initials on a document to show that you agree with it.

v. to mark or sign a document with one's initials, typically to indicate approval or to acknowledge a specific clause.

“Please initial each page of the contract before you sign the last one.”

“The lawyer requested that both parties initial the handwritten amendments in the margin to ensure the changes were legally binding.”

Formal