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Discover Ludwig"capital letter" is not a correct and usable part of a sentence in written English.
You can use it informally in some contexts, such as: "Remember to start every sentence with a capital letter!".
Dictionary
capital letter
noun
An upper-case letter (A, B, C, ... as opposed to a, b, c, ...), used for emphasis, for starting sentences and proper names, etc.
Exact(60)
He liked a capital letter, didn't he?
A capital letter A is always sewn onto Cal's clothing.
From Latin the capital letter K came into English unchanged.
The shape of Greek capital letter Θ (Theta) reflects two sets of such components (two sets of tendons, cables etc).
"You are a Patriot with a capital letter," wrote Borys Filatov, an oft-critical parliamentarian.
(13) A capital letter at the beginning of a sentence is a private joke.
I even spell Member with a capital letter because I understand how important they are.
Proper nouns begin with a capital letter.
The dark blue of the capital letter U is composed of lapis-lazuli (Figure 8, right).
Bold symbols in capital letter and small letter denote matrices and vectors, respectively.
For notational clarity, we use capital letter symbols for stocks, while lower case letters denote flows.
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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