One method of writing multi-word identifier names in computer languages that tokenize on whitespace. For example, a variable called "my favorite variable" could be written

myFavoriteVariable (lower camel case)
MyFavoriteVariable (upper camel case)
my_favorite_variable (underscored)
my-favorite-variable (dashed)
myfvvbl (some people would actually use this one)

Much has been argued over whose style is better. C programs historically use underscored identifiers, while Java programs typically use lower camel case for identifiers and upper camel case for classnames. YACSFW (yet another coding style flamewar)