full stop/s

Usually when the last word of a sentence is an abbreviation with a period (stop), the period is understood to serve both as the punctuation for the abbreviated letter and as the final stop for the sentence. So there should be only one stop.

What do you mean by 'usually'? You mean there are sentences in which two full stops are required after an abbreviation. If so, could you give me an example sentence?

Many thanks.

I said "usually" only because I consulted only one style guide (The Chicago Manual of Style, 13th ed.) when I tried to find an official ruling on this question. I didn't want to assume that the Chicago Manual's guidelines were followed everywhere, though personally I have never seen an instance of a double stop at the end of a sentence.

There is only ever ONE full stop. Period. Never, ever do you use two, as in:

I woke her up at 7:00 a.m.. WRONG! It's ... 7:00 a.m.

one . is a period (full stop) or as in the case above, an abbreviation, and three ...'s mean a pause or an omission... there are never two ..'s ever.

Wow! That's right.

Logically there should be two in the example you give, Yoong Liat, but it is the convention to put only one.

It's true that you would never have two periods in a row. However, there is a situation in which there are two periods at the end:

The colors varied (blue, red, green, etc.).

Thanks for all the replies.