Meaningof upper and lower case letters
Upper case letters are capital letters, for example, CAPITAL, the C is upper case, the A is upper case, the P is upper case, the I is upper case, the T is upper case, the A is upper case, the A is upper case, lower case letters are what you are reading right now, for example: this sentence is in lower case. Hope that helps.
do you mean different fonts or typestyles?
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