VLF—Very-low frequency.
X
W
XBT—Expendable
bathythermograph,
usually
referring to the probe that is dropped in the water
WBGT—Wet-bulb globe temperature.
and not recovered.
WEATHER—The state of the atmosphere with respect
to its effect upon life and human activities.
XSV—Expendable sound velocimeter, usually refers to
probes that are dropped in the water and not
WMO—World meteorological organization.
recovered.
AI-5
