Upper case is the opposite of lowercase. As you can see the text I'm writing, some of the letters look larger than the others, this is because I'm appropriately switching to uppercase.
Here's an example of uppercase: 'HELLO MY NAME IS JOHN'
Here's an example of lowercase: 'hello my name is john'
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upper case
Both. "Case sensitive" means that upper case and lower case characters are treated as different characters.
no.
Yes upper and lower case letters can simultaneously be used as password features.
upper case Σ, lower case σ. In maths, the upper case is used when describing sums and the lower case when referring to standard deviations. It's the 18th letter of the Greek alphabet and has an s sound.