Special or control characters are invisible on the screen. They have special purposes usually to do with cursor movement and are written into an ordinary string or character by typing a backslash character \ followed by some other character.
In the hello example, the special character is “\n”.
These characters are listed below.
|\n||new line NL (like pressing return)|
|\r||carriage return CR (cursor to start of line)|
|\t||horizontal tab HT|
|\"||double quotes (not all versions)|
|\'||single quote character '|
|\\||backslash character \|