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2. Risk-aware consensual kink - Wikipedia

   en.wikipedia.org/wiki/Risk-aware_consensual_kink

   Risk-aware consensual kink ( RACK, also risk-accepted consensual kink) is an acronym used by some of the BDSM community [ 1][ 2] to describe a philosophical view that is generally permissive of certain risky sexual behaviors, as long as the participants are fully aware of the risks. [ 3] This is often viewed in contrast to safe, sane, and ...

3. Rack (torture) - Wikipedia

   en.wikipedia.org/wiki/Rack_(torture)

   The rack is a torture device consisting of a rectangular, usually wooden frame, slightly raised from the ground, [ 1] with a roller at one or both ends. The victim's ankles are fastened to one roller and the wrists are chained to the other. As the interrogation progresses, a handle and ratchet mechanism attached to the top roller are used to ...

4. Rack and pinion - Wikipedia

   en.wikipedia.org/wiki/Rack_and_pinion

   A rack and pinion has roughly the same purpose than a worm gear with a rack replacing the gear, in that both convert torque to linear force. However the rack and pinion generally provides higher linear speed — since a full turn of the pinion displaces the rack by an amount equal to the pinion's pitch circle whereas a full rotation of the worm screw only displaces the rack by one tooth width.

5. Racks and quandles - Wikipedia

   en.wikipedia.org/wiki/Racks_and_quandles

   In mathematics, racks and quandles are sets with binary operations satisfying axioms analogous to the Reidemeister moves used to manipulate knot diagrams. While mainly used to obtain invariants of knots, they can be viewed as algebraic constructions in their own right. In particular, the definition of a quandle axiomatizes the properties of ...

6. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The ETSI rack is defined by the European Telecommunications Standards Institute (ETS 300 119). The distance of the right edge of the right mounting rail to the left edge of the left mounting rail is 535 millimetres (21.1 in). As 535 mm is very close to 21 inches, these racks are sometimes called 21-inch racks. The gap between the posts is 500 ...

7. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...