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Lincoln logs use a very simple form of genderless connections.Kapla or KEVA planks are extremely simple genderless systems interconnected only by gravity.In terms of mathematical graph theory, an electrical power distribution network made up of plugs and sockets is a directed tree, with the directionality arrows corresponding to the female-to-male transfer of electrical power through each mated connection.
Downspouts (downpipes, rain conductors or leaders) are used to convey rainwater from roof gutters to the ground through hollow pipes or tubes.
For example, the female D-subminiature connector body projects outward from the mounting plane of the chassis, and this protrusion could be erroneously construed as male.
Instead, the "maleness" of the D-subminiature connectors is defined by specific presence of male pins, rather than by the protrusion of the connector, which is also true for many other pin-based connectors like XLR.
Although the gender of tubing and plumbing fittings is usually obvious, this may not be true of electrical connectors because of their more complex and varying constructions.
Instead, connector gender is conventionalized and thus can be somewhat obscure to the uninitiated.
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.