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Names generally have spaces between the initials because they are representing two names, but that's a matter of personal preference. k.d. lang uses periods but not spaces or capitals. e e cummings...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/14460 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/14460 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Names generally have spaces between the initials because they are representing two names, but that's a matter of personal preference. k.d. lang uses periods but not spaces or capitals. e e cummings used spaces but not periods or capitals. J. K. Rowling uses all three. The company JPMorgan Chase uses capitals but no periods or spaces in the parent company name, but styles the brand name as J.P. Morgan. P.S. and U.S.A. are abbreviations (I have often seen USA with no periods), and always function as a unit, so the spaces aren't necessary.