I’d heard of upper case, lower case, proper case, sentence case, title case, but camel case is new to me.
iPad, iMac and eBay are examples of words in camel case. That is, joined words with the initial letter of each word capitalised, apart from the first word.
Joined words with the first joined word also capitalised (eg FedEx, WordPerfect, WordPress) are sometimes described as being in camel case, but generally camel case implies the first letter of the first joined word is in lowercase.
Lower camel case and upper camel case can be used to distinguish between the two situations.
things change 
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