Abbreviations #em#a.m., p.m., No.#/em#, and #em#$#/em#
Use the following abbreviations only with specific times, numbers, and monetary amounts.
4:23 a.m. (or 4:23 AM)
6:00 p.m. (or 6:00 PM)
No. 12 (or no. 12)
$150, £300, ¥800
Avoid using these abbreviations when they are not accompanied by a specific figure.
When not using a.m. or p.m., write out the time in words (four o’clock in the afternoon, twelve noon, seven in the morning).
Exercise: Abbreviations
Related topic:
Capitalizing abbreviations