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This icon visualizes function composition, (f∘g)(x), as a two-stage transformation pipeline. A filled circle (the input, x) travels along a connecting line through a hollow diamond gate (function g), emerging as a solid diamond (g(x)) the gate's outline matches the shape it stamps the value into. The diamond then passes through a second hollow gate, a triangle (function f), emerging as a solid triangle (f(g(x)), the final output). A directional arrow beneath the sequence makes the left-to-right order explicit, while a bold arc sweeping above connects the original circle straight to the final triangle, showing that the two-step chain and the single composed function are the same mapping. The design favors structural mechanism over static notation, with no numerals or labels, following a punched dark-teal-and-cyan icon style built from a single compound vector path.