What punctuation follows an abbreviation?
Traditionally, a full stop (also known as a period in the US)
follows an abbreviation. However, where UK English is employed,
such as the UK, Australia and New Zealand, placing any punctuation
after an abbreviation is outmoded, and no longer required. For
example, a word such as Dr or Mr has no full stop after it in
Australia, but in the US it is still written as Dr. or Mr.