Is a point is named by a lowercase letter? I don't think so. A point is labeled by capital letters.
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As proper nouns they should be written with an initial uppercase letter followed by the rest of the letters in lowercase.
Nu is the symbol for frequency, which looks like a lowercase v.
Back before the reinvention of movable type came to Europe typesetters would have to manly you set letter in a CASE or case like box to crete a continuos line of type. Therefore it was a big letter it was called Uppercase and small Lowercase.. does that make some sense?
A capital letter is defined by being printed in a larger size or different form than its corresponding lowercase letter. Pretty much any letter which is printed in a larger format can be capital letter.
The symbol is the letter "d". Example: dm (decimeter). Note: The letter has to be in lowercase. Uppercase "D" means Deka, which is a factor of 10 instead of 0.1.