Serpentine

Serpentine just means "wavy". This shape is die cut on some self-adhesive stamps to allow separation, and can be of different depths/degrees of waviness.

Finland used a serpentine roulette for their early issues. It is indeed a roulette, as decently preserved examples show the "teeth" with the tiny attachment points still intact.

 File:Finland serp roul.A.webp|Finland stamp with serpentine roulette. File:Netherlands December selfadh.jpg|Netherlands stamp with serpentine die cut (2001). 

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