The Period: The Period (#3)

One very common and important punctuation mark
( . ) looks like a small, dark circle. When this mark is
used with numbers, it's called a point. When it's used
in e-mail and WWW addresses, it's called a dot. In
other situations, it's called a period.

In American English, there are many common uses
for the period. Besides abbreviations of titles, the period
is also used for many other types of abbreviations. One
group of abbreviations is used for time:

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Special Notes