upper case
noun /ˌʌpə ˈkeɪs/
  /ˌʌpər ˈkeɪs/
[uncountable] (specialist)- capital letters (= the large form of letters, for example A, B, C rather than a, b, c)
- Headings should be in upper case.
 - upper-case letters
 
Word Originreferring originally to two printer's type cases positioned on an angled stand, the case containing the capital letters being higher and further away from the compositor.