Velcro$^{®}$.  The commercial name for hook and pile  nylontape fastener. Tandem.  A dual harness, dual parachute system for use by  two people under the same main parachute. Tapes.  Narrow woven ribbons used for reinforcing parachutes. Tape fastener.  Velcro$^{®}$. Velocity.  A vector quantity that includes both magnitude  (speed) and direction relation to a given frame of reference;  also the time rate of change of position. Vent.  The opening at the top, or peak, of the canopy. Technical standard order.  A minimum performance standard  for specified articles, such as materials, parts, processes, or  appliances used on civil aircraft. Vent cap.  A piece of fabric sewn to the upper lateral band  and covering the vent; also known as a vent patch. Warp.  The threads that run parallel to the selvage edge of  cloth; those which are crossed by the filling threads. Tension plate.  A device hooked into the connector links in  order to put tension on the canopy while packing. Thread.  A thin continuous filament made by spinning fibers  and combining the strands. Weave.  The forming of a textile by interlacing yarns. The  making or manufacturing of cloth on a loom by interlacing  warp and filling yarns. Title 14 of the Code of Federal Regulations (14 CFR).  The  rules, regulations, and guidelines established by the FAA to  govern the operation of aircraft, airways, airmen, and the  safe operation of civil aircraft. Webbing.  A stout, closewoven tape used for straps, belts,  harnesses, etc. Toggle.  A knob or webbing loop at the end of the steering  line for grasping by the parachutist. Weight.  Gravitational force on a mass. Weight (fabric).  The weight of fabric measured in ounces  per square yard. Trimming.  Clipping or paring to reduce to a neat orderly state. Tubular nylon.  Sleevelike weave, seamless, and pressed  flat, similar in appearance to tape, but stronger and hollow  in the center. Wrinkles.  A series of small pleats. W Z U Zigzag.  A stitch formation of alternating left and right throw stitches, usually made on a sewing machine that moves the  needle bar alternately left and right during sewing. Zipper.  A slide fastener. Tuck.  A shortening of material caused by pulling fabric up  in folds and stitching across the gathered fabric. Ultimate load.  Maximum load that can be applied without  causing any part of the structure to fail. Ultraviolet light damage.  Degradation of nylon fabric  by exposure to sunlight or fluorescent lights. Identified by  a yellowish color on white fabric or excessive fading to  colored fabric. United States Parachute Association.  A nonprofit division  of the National Aeronautic Association (NAA) that governs  sport parachuting activities in the U.S. V-ring.  A metal fitting shaped in the form of a closed letter  V, used with snaps to secure or attach a load to a parachute. V  G-12