Why do some Alt code lists differ online?
Because some lists mix true keypad Alt codes with Unicode hex input or editor-specific shortcuts. Those are related but not identical.
Understand Alt codes, when they still matter, and how to find practical Windows inputs for common symbols.
Alt codes are one of the oldest Windows input methods for special characters. They still matter in legacy workflows, spreadsheets, document editors, and support routines.
Classic Alt codes use decimal keypad input. Modern Windows workflows often mix those with Unicode hex values and Alt+X depending on the app.
Because some lists mix true keypad Alt codes with Unicode hex input or editor-specific shortcuts. Those are related but not identical.
Usually no. Keep a reliable reference for your most-used symbols and memorize only the handful you enter constantly.