PascalCase

Pascal case is the capital pattern with empty string delimiter.

Pascal case is also known as upper camel case.

History

Pascal is a case-insensitive language, so the same identifier can be referenced using a different mixture of upper and lowercase letters each time.

This document¹ with footer dating it at 1998 suggests Pascal case for most identifiers, additionally describing prefixes to prepend to certain types. (todo: figure out what what convention is called).

This other document² calls Pascal case infix caps. It suggests using infix caps for all identifiers.

The GNU Pascal manual³, last updated in 2005, describes Pascal case as the following:

Only the first letter should be capital, or, if there are concatenated words or acronyms, the first letter of each word should be capital – do not use underscores.

Additionally, it comments on acronyms.

Acronyms that have become part of the natural language can be written like that.

Examples

Rust uses Pascal case for struct, enum, and trait names.

enum Answer {
    MoreThanOnce,
    ExactlyOnce,
    Never,
}

impl TryFrom<i32> for Answer {
    type Error = ();

    fn try_from(num: i32) -> Result<Self, Self::Error> {
        match num {
            i if i == 0 => Ok(Answer::Never),
            i if i == 1 => Ok(Answer::ExactlyOnce),
            i if i > 1 => Ok(Answer::MoreThanOnce),
            _ => Err(()),
        }
    }