https://help.tallysolutions.com/docs/td9rel54/td9/using_the_editor/syntax_coloring/actions_and_functions.htm

Syntax Coloring for Actions and Functions

Action names and Function names are colored in blue.

All other attributes which are not identified as attributes are colored in violet.  It includes variables under System Variables definition, UDFs under System UDF definition, labels under Function definition and other Formulas.

In the above code snippet, within the Function definition, labels 01, 02, 03 and 04 are colored in violet as they are not identified as attributes of Function definition.