Weather strip.

A quick learner says:
Small diamond ? shape goes into the groove of sliding window.
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Casey from SWISCO responded:

Hello,

I'm afraid we don't have a sweep that resembles your sample. To determine if we can locate a possible replacement, we'd need you to confirm the exact size of the piece that slides into the door. Thank you. 

A home owner from CLEARWATER says:
Hello, the dimensions are on the picture.
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Dave Sr. from SWISCO responded:

Unfortunately, we do not carry a replacement door sweep with the same base shape as yours. With that being said, take a look at the 58-014 wool pile. This skirting was used by patio door manufacturers at the bottom of the operating door. See if this is something that could work for you.

Profile view of 58-014
Profile view of 58-014

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