Please STOP IT!
by Rory C. Keel
Sentences
To end sentences use a full stop to end affirmative sentence.
Example: I go to work every day.
Orders
Use a full stop to end orders.
Example: Stop pestering the dog.
After Abbreviations
The full stop after abbreviations is optional in American English, but not usually used in British English.
Acronyms
Don’t use a full stop after acronyms.
Example: VA, USO