The door handle design:
is a combination of musical clefs G clef and F clef. A "clef" s a musical symbol used to indicate the reference point of written notes.
In recent years I have made a number of music stands and music cabinets so I have used this "Clef" design as a height adjustment pin for a music stand
and as a door pull for music cabinets.
A comprehensive article on Clefs and Notation can be found at the link below