Hello Anon, I wouldn't do it myself; but it's still quite common in British usage, and seems to be taught on typing and secretarial courses, etc. I think the rationale is to permit a distinction between a stop after an abbreviation and a stop at the end of a sentence. ) All the best, MrP
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AlpheccaStarswhat is considered proper would depend on the style guide in the organization you are writing for.