. ⇦ “period”

When do we use periods?

1. • At the end of a sentence
2. • for abbreviations
   
   1. ◦ U.S.A.
   2. ◦ U.K.
   3. ◦ Mr.
   4. ◦ Ms.
   5. ◦ Mrs.
   6. ◦ Eta.
   7. ◦ Est.
   8. ◦ Approx.
   9. ◦ M.D.
   10. ◦ American Units
       
       1. ▪ mi.
       2. ▪ ft.
       3. ▪ lb.
   11. ◦ NOT with Metric Units
       
       1. ▪ m
       2. ▪ L
       3. ▪ mL
       4. ▪ km
       5. ▪ g
       6. ▪ kg

Always put a space ( ) after a period or comma.

Mr.Jones                                                 Mr. Jones

Never put two periods together.

This is Loretta Jones, M.D..                 This is Loretta Jones, M.D.

I am from the U.S.A..                             I am from the U.S.A.

When quoting, periods become commas.

“I have a question.” said Lilly.             “I have a question,” said Lilly.