Attachment short form in mail

You're referring to the short form of "attachment" in an email!

In email, the short form of "attachment" is often abbreviated as:

You can use any of these abbreviations in your email subject line or body to refer to a file or document that you're sending along with your email.

For example:

Remember to always include the file name and type (e.g., "report.pdf") to help the recipient identify the attachment correctly.