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In documentation for electrical vehicles there is a common acronym for "state of charge" that is written as "SoC" or "SOC".

Are both versions equally ok, or are there rules guiding when to mix case, and when not to mix case?

I hope this question doesn't fall under the category "Questions that are primarily opinion-based", which I learned are not be asked here (I just signed up).

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    Given that the acronym won't have much meaning outside of the EV domain, I'd suggest looking at the existing documentation and using the most common version...of course, that's just my opinion. Oct 23, 2023 at 16:01
  • Why don't you do the research instead of us? It generally depends on what the authors want. There is no rule.
    – Lambie
    Oct 23, 2023 at 16:30
  • Of course I tried to find an answer before asking here. Maybe my skills using Google and ChatGPT could be better, of course. That I did not find a rule did not prove to me there was none, hence the post here.
    – Toby
    Oct 23, 2023 at 16:54
  • Here’s the part where someone tosses in the observation that many authorities advise against calling SoC or SOC an acronym if it’s not pronounced like sock, the name of the article of clothing. If instead they are pronounced “ess oh see,” then those authorities would call it an initialism. NASA? Acronym. FBI? Initialism. Oct 23, 2023 at 21:50
  • Of course it could also be SC, as words like "of" aren't always included in abbreviations (e.g. USA). These things seem to be governed by fashion, but assuming this is fairly recent as an EV term, I'm not sure what is currently in style.
    – Stuart F
    Oct 23, 2023 at 21:59

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The rules of when lowercase is acceptable are fairly loose, the most important thing is to be consistent with existing literature, or if there is none, be consistent with whatever form you pick. Oftentimes you'll see acronyms use all capital letters, but it is also acceptable to represent shorter or less important words as lowercase letters, mimicking the capitalization that would be used in title case. You'll rarely be wrong using all-caps, but watch out for existing acronyms that use lowercase.

I'm not familiar with the acronym you mention, but a similar one, "standard of care", can be abbreviated as either SoC or SOC depending on the style of the author. It seems either would be acceptable in your case as well.

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