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It's actually G(L)TF but in this case it's really 3D Tiles (a related format that uses GLTF) https://www.ogc.org/standard/3dtiles/

I see, that is an unnecessarily confusing naming convention in the title.

I've never seen it stylized that way. Officially, it's "glTF", but people frequently use "gltf" or "GLTF" without confusion.

Stands for GL Transmission Format if that helps.