Pascal - Identifiers
Identifiers are used in programming languages to "identify" or name a keyword, variable, constant, function, procedure, type, or program.
Identifiers in pascal can have up to 255 significant characters, meaning that the first 255 characters of each identifier must be unique. Identifiers in pascal must abide by the following syntax diagram.
Here are some examples of valid identifiers.
A reserved word is a valid identifier that is used to identify something within the programming language itself. This means that these identifiers cannot be used to identify variables, etc. within your programs.
Pascal also has the following modifiers. These identifiers have special meaning to the compiler, but can also be used as identifiers within your programs. As these do have special meaning to the compiler they are best avoided as identifiers within your programs.