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Discover LudwigThe phrase "capital letters" is correct and usable in written English.
It is typically used to refer to letters of the alphabet that are written in uppercase (such as A, B, C). For example, "Please write your name in capital letters."
Dictionary
capital letters
noun
Plural of capital letter
Exact(60)
In capital letters?
Where are the capital letters?
(The capital letters are his).
No capital letters.
Several were typed in capital letters.
And yes, Justin spoke in capital letters.
Next come the capital letters.
Capital letters will be lowercased.
Names in capital letters denote incumbents.
I actually typed "FUN!" in capital letters.
One wrote without capital letters or punctuation.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com