A Geometry shader is a type of shader not currently supported by the game which sits between the vertex shader and the fragment shader. Geometry shaders are optional so that is why they currently aren't used. A geometry shader takes as input a set of vertices that form a single primitive like a point or a triangle. The geometry shader can then transform these vertices as it sees fit before sending them to the next stage.
These would be a handy tool to have when making shader packs.
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