camel case

or camel·case, Camel·Case

noun

1. the convention of writing compound words or phrases with no spaces and an initial lowercase or uppercase letter, with each remaining word element beginning with an uppercase letter:

   iPod and WikiAnswers are both spelled in camel case.

Word History and Origins

Origin of camel case¹

In reference to the capital letter creating a hump in the series of letters

Example Sentences

A less obvious difference is the dropping of the camel case, so from here on out it’s going to be Mastercard or, as above, mastercard, and not MasterCard.

From The Verge