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Per the discussion in the comments: if you're using sentence case, I'd go with 4-terminal (lowercase T) because the 4 is the first character. (I would still flinch to see a sentence which started...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/12912 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/12912 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/