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All these are upper case letters: ABCDEFGHIJKLMNOPQRSTUVWXYZ All these are lower case letters: abcdefghijklmnopqrstuvwxyz
Upper and lower case is a reference to the way Typesetters store their letters. Capital letters were stored in the Upper drawers and the regular letters in the lower drawers. Hence, if they requested an Upper case "L" it meant they wanted a capital "L".
Lowercase and upper case letters refer to how a letter is written - as a capital letter ("A" for example) or as a small, lowercase, letter ("a" for example). Here are all the capital letters in the alphabet: ABCDEFGHIJKLMNOPQRSTUVWXYZ Here are the same letters as lowercase: abcdefghijklmnopqrstuvwxyz Upper case (capital) letters are used to begin sentences and for proper nouns, such as names.
Examples: QWERTY is upper case i.e. capital letters qwerty is lower case