2 1/2D is a conventional way of describing a process for obtaining an object where the third dimension is somehow dependent from the transversal cross-section of the same. ^{[1]}

11 relations: Casting, Convention (norm), Cross section (geometry), Extrusion, Forging, Horizon, Infinity, Injection moulding, Microextrusion, Plastics extrusion, Three-dimensional space (mathematics).

Casting is a manufacturing process by which a liquid material is usually poured into a mold, which contains a hollow cavity of the desired shape, and then allowed to solidify.

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A convention is a set of agreed, stipulated, or generally accepted standards, norms, social norms, or criteria, often taking the form of a custom.

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In geometry and science, a cross section is the intersection of a body in three-dimensional space with a plane, or the analog in higher-dimensional space.

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Extrusion is a process used to create objects of a fixed cross-sectional profile.

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Forging is a manufacturing process involving the shaping of metal using localized compressive forces.

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The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those that do not.

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Infinity (symbol) is an abstract concept describing something without any limit and is relevant in a number of fields, predominantly mathematics and physics.

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Injection moulding (injection molding in the USA) is a manufacturing process for producing parts by injecting material into a mould.

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Microextrusion is a process used to create objects with a fixed cross-sectional profile or eventually a dynamic long-sectional profile in the case of 2 1/2D extrusion,.

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Plastics extrusion is a high-volume manufacturing process in which raw plastic is melted and formed into a continuous profile.

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Three-dimensional space (also: tri-dimensional space) is a geometric three-parameter model of the physical universe (without considering time) in which all known matter exists.

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## References

[1] https://en.wikipedia.org/wiki/2_1/2D