What is abbreviation for regarding?

The abbreviation for regarding is "re." or "regd." It is often used in written correspondence or emails to indicate that the content of the message pertains to a certain topic or subject matter. It is a commonly used shorthand that saves time and space. Similarly, other common abbreviations for correspondence include "f.y.i." (for your information), "e.g." (for example), "i.e." (that is), and "p.s." (postscript). It is important to use these abbreviations appropriately and sparingly to avoid confusion or miscommunication.