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Wikipedia

CamelCase

camelCase (also camel caps or medial capitals) is the practice of writing compound words or phrases such that each word or abbreviation begins with a capital letter (and omits hyphens). Camel case may start with a capital letter (called PascalCase or UpperCamelCase) or, especially in programming languages, with a lowercase letter. Common examples include: " PowerPoint" or " MySpace" and " iPhone", " macOS", or " eCommerce". It can also be used in online usernames such as "JohnSmith".

Wiktionary

camelcase

n. (alternative spelling of CamelCase English)