Both. "Case sensitive" means that upper case and lower case characters are treated as different characters.
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upper case
no.
Yes upper and lower case letters can simultaneously be used as password features.
Lower case Roman numerals have exactly the same value as upper case numerals
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.