Access an accented glyph directly, that is, without having to put an accent over a separate character.
This line from t1enc.def means that
\^o will cause LaTeX to typeset lowercase ‘o’ by taking the character directly from location 224 in the font.
See fontenc package, for a list of common encodings. The simple_object should be a single character or a single command. The slot argument is usually a positive integer represented in decimal (although octal or hexadecimal are possible). Normally cmd has already been declared for this encoding, either with
\DeclareTextAccent or with a one-argument
\DeclareTextCommand. In t1enc.def, the above line follows the
© 2007–2018 Karl Berry
Public Domain Software