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Q&A Spaces within abbreviations, acronyms, and initials

I have come across examples supporting both spaced as well as non-spaced examples and that's what confuses me. I want to understand what the standard practice is as endorsed by any of the major sty...

1 answer  ·  posted 10y ago by TheLearner‭  ·  last activity 5y ago by System‭

#3: Attribution notice added by user avatar System‭ · 2019-12-08T03:52:59Z (almost 5 years ago)
Source: https://writers.stackexchange.com/q/14455
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision by user avatar TheLearner‭ · 2019-12-08T03:52:59Z (almost 5 years ago)
I have come across examples supporting both spaced as well as non-spaced examples and that's what confuses me. I want to understand what the standard practice is as endorsed by any of the major style guides. For example, consider the following examples:

> A. B. Smith (Why is there a space?)
> 
> U.S.A (Why no space? And why no period after the "A"?)
> 
> P.S. (Why no space?)

I understand there already exists a similar question but since the answers on that one specifically deal with academic citations and Latin phrases, it doesn't help me. I am comfortable with Latin phrases, such as e.g., i.e., etc. not having spaces (P.S. being an exception because I still somehow see it as a regular abbreviation because it's capitalized, maybe? I don't know). It's the English acronyms that I find confusing... especially cases like U.S.A where even a period (the last one) is sometimes mysteriously omitted!

#1: Imported from external source by user avatar System‭ · 2014-11-19T11:51:57Z (about 10 years ago)
Original score: 3