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While some mechanical designs are "one-off" custom setups not intended to be repeated, there is an entire fastener industry devoted to manufacturing mass-produced or semi-custom components.

To avoid unnecessary confusion, conventional definitions of fastener gender have been defined and agreed upon.

In mechanical design, the prototypical "male" component is a threaded bolt, but an alignment post, a mounting boss, or a sheet metal tab connector can also be considered as male.

Correspondingly, a threaded nut, an alignment hole, a mounting recess, or sheet metal slot connector is considered to be female.

A picture of such fittings appears in the #Genderless (hermaphroditic) connectors section of this article.

Downspouts (downpipes, rain conductors or leaders) are used to convey rainwater from roof gutters to the ground through hollow pipes or tubes.

Mathematicians have begun to classify well-known construction sets using group theory to study the combinatoric possibilities of structures that can be built.

Kapla or KEVA planks are extremely simple genderless systems interconnected only by gravity.However, since one-way flow is implemented by forced-air fans or blowers, "backwards" gendered connections can be seen frequently in some systems, since all connections are typically sealed with duct sealing mastic or tape to prevent leakage anyway.The flow convention is usually loosely adhered to for simplicity of design, and to reduce the number of gender changer fittings required, but exceptions are made whenever expedient.embody gendered (and in some cases, genderless) mechanical interconnections.This should not be surprising, since these toys feature the nearly infinite flexibility and versatility of shape that a modular interconnect architecture can enable.

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