from
Jargon File (4.4.4, 14 Aug 2003)
PascalCasing
The practice of marking all word boundaries in long identifiers (such
as ThisIsASampleVariable) (including the first letter of the
identifier) with uppercase. Constrasts with camelCasing, in which the
first character of the identifier is left in lowercase
(thisIsASampleVariable), and with the traditional C style of short
all-lower-case names with internal word breaks marked by an underscore
(sample_var).
Where these terms are used, they usually go with advice to use
PascalCasing for public interfaces and camelCasing for private ones.
They may have originated at Microsoft, but are in more general use in
ECMA standards, among Java programmers, and elsewhere.