Changing the meaning of socket shapes for Blender 5.0.

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Blender

Blender 5.0 introduces a redesigned socket shape system for Geometry Nodes to support new features like volume grids and lists. The new system uses four main shapes: vertical bars for single values, diamonds for fields, circles for dynamic data types, and specialized shapes for grids/lists. Socket shapes now communicate what data a node expects or generates, independent of usage context. This change removes some previously available visual information but enables development of blocked features that couldn't progress with the old design.

New Socket Shapes — Blender Developers Blog