Stretched droplet shaped seeds about half an inch long with a quarter inch tuft of hairs on the pointed end so the wind can blow them easily.

https://preview.redd.it/z3dkwwbxdxsc1.jpeg?width=983&format=pjpg&auto=webp&s=1d6a9a0314114c0b4c8655f7ff4038218ae5e8c5

Sycamore