It looks like the symbol for Pi. Click on each photo below to view additional images and information.
Specifications

About this record
Catalogue entry P-21300 is an antique doorknob recorded in the Public Buildings/Seals category (Category P, Symbols, Logos, Words & Numbers) of the Antique Doorknob Collectors of America archive. It was made by Yale & Towne. The pattern belongs to the Emblematic school of ornament.
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Moving off a platform we had outgrown
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