What is "djsr"

The ancient Egyptian horizontally-outstretched Arm with a Power stick is a hieroglyph with the meaning of "force", or "power of action". As a baton, or macehead. Power is obvious, but the origins may have also had references to magic, or the idea of driving-off bad spirits or omens.

A "sacred", or protected area is therefore created, by the action implied and used by the "Arm with Power stick". A term used in later Ancient Egypt was 'ta djeser', the 'land-sacred'. Thus temples, or mortuaries, or areas for ritual could be created.