"uppercases" in the noun sense
1. capital, capital letter, uppercase, upper-case letter, majuscule
one of the large alphabetic characters used as the first letter in writing or printing proper names and sometimes for emphasis capitals were kept in the upper half of the type case and so became known as upper-case letters"
"printers once kept the type for capitals and for small letters in separate cases
Source: WordNet® (An amazing lexical database of English)
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