Halogen:
Any of the four non-metallic elements flourine, chlorine, bromine and iodine.
Related info: Types of lighting
Head (1):
The component which records an electrical signal onto magnetic tape, or reads a signal from tape into an electrical signal.
Related info: Cleaning video heads
Head (2):
The part which the camera is mounted on, atop a tripod, pedestal or other mounting. Allows the camera to pan and tilt.
More info: Camera Tripods
Headroom:
The amount of space between the top of the subject's head and the top of the picture frame.
More info: Camera framing
HD DVD: A high-definition DVD format supported by a group of manufacturers led by Toshiba.
More info: The HD DVD Format, HD-DVD vs Blu-ray
HDMI: High-Definition Multimedia Interface. A digital connection used in home entertainment systems.
More info: HDMI connectors
HMI:
Hydrargyrum Medium-Arc Iodide, a type of light which uses an arc lamp instead of an incandescent bulb to produce light.
More info: HMI Lights
Hot (1):
An image or part of an image which is excessively bright, i.e. overexposed.
More info: Iris & Exposure
Hot (2):
The wire in a cable, and the connecting pins, which carry the signal.
Related info: Audio cables and connectors
Hz:
Hertz. Cycles per second.