What is "Encl A/a" in letter?

Many a times you will notice "Encl: A/a" at the end of a letter.

Well what does it mean? - "Encl: A/a" is the short for "Enclosure As Above".

It is generally mentioned to indicate that there are documents or things enclosed or attached along with the letter.

It serves a good purpose in not-missing-out on important enclosures.