Exterior door weather seal.
A home owner from Seattle, Washington says:
September 16, 2015
Exterior door weather seal. Approximately 15 years old. The "V" fits into a wood channel and is rigid. The rounded part is soft foam covered in a vinyl like product.
Tom from SWISCO responded:
September 17, 2015
This looks like our 58-056. This looks like a good match to me, but let me know what you think.