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# 2 1/2D

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]

## Casting

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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## Convention (norm)

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

## Cross section (geometry)

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.

## Extrusion

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

## Forging

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

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## Horizon

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

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

## Injection moulding

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

## Microextrusion

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,.

## Plastics extrusion

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

## Three-dimensional space (mathematics)

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.

## References

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