CamelCase is formed by taking a phrase, capitalising the initial letter of each word, and smashing the words together to form a portmanteau word. Traditionally most wikis including TiddlyWiki use CamelCase to signal phrases that should automatically become links.
You can also disable CamelCase linking in TiddlyWiki if you want.
New in v5.3.0 CamelCase is disabled by default in new wikis.