Majuscules or capital letters (in the Roman alphabet: A, B, C, ...) are one type of case in a writing system. Compare minuscule (a, b, c, ...). Majuscules and minuscules are sometimes also known as uppercase (or upper case) and lowercase letters, respectively (for example, in computer programming).
Even in alphabets with a case distinction, majuscules are used:
- for capitalization,
- for acronyms,
- for better legibility, e.g. on signs and in labelling, and
- in some languages, as a means of emphasis.
- Note: the use of majuscules for emphasis in situations where bold or italic type would suffice is generally considered to be a bad habit, albeit one that is quite common in the United States, particularly in email, Usenet, or in chat rooms.