Xenon is an inert gas, a chemical element, used in high intensity lighting. Xenon lighting used in video production and film-making, is further strengthened by use of a polished parabolic reflector to intensify the light source. (Lighting)
A triple conductor connector commonly found in studios and can be commonly seen connected (an XLR jack) to a microphone. An XLR jack has three or more conductors plus an outer case, shielding and locking the connectors together. (Sound)
An X-Y Pattern is used for stereophonic pickup by video production companies. Two (cardioid) microphones are placed in crossed directions, producing a stereo pickup. (Sound)