Periods
I've been musing recently about minutiae of English punctuation: apostrophes, periods, commas, and all the rest of it. There is considerable variation in usage on many points, and astonishingly passionate opinion about some of these points, even when they are mind-numbingly inconsequential.
Case in point: the use of periods in abbreviations composed of initial letters: I.B.M. or IBM? U.C.L.A. or UCLA? F.B.I. or FBI? Style guides vary, from those that are fond of periods (because the periods clearly mark the words as abbreviations and indicate where material has been suppressed) to those that are shy of them (because the result looks cleaner and takes up less space). Something can be said in favor of each scheme, and there is no issue of substance here. But some people have strong preferences.
The Wikipedia entry on abbreviation surveys a variety of schemes, noting that
The New York Times is unique in having a consistent style by always abbreviating with periods: P.C. [personal computer], I.B.M., P.R. [public relations]. This is in contrast with the trend of British publications to completely make do without periods for convenience.
Now a few words about the NYT's practices, and about the value of consistency.
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