* 12 AM technically refers to the start of a new day (midnight).

* 12 PM technically refers to noon.

Therefore, you should only use 12 AM to refer to midnight.

To avoid confusion, you can also use these alternatives:

* Midnight

* 12:00 AM

* 00:00 (using the 24-hour clock)

Remember, using "12 PM" for midnight can lead to misinterpretations.