Technology
RADAR
Radar, Wikipedia
Radar has become a word in itself. Perhaps many of us do not really know that it is really an acronym.
Well let us be reminded. RADAR stands for RA(dio) D(etecting) A(nd) R(anging). It was coined by the United States Navy in 1940.
Apparently many nations started working in earnest developing the radar during the Second World War.
As what the word is commonly known now, the radar system is used for detection, i.e. looking for aircraft, ships, UFO, etc.
A radar functions by sending short radio waves which are then reflected back, the result will ascertain the presence, direction, and range of what is being investigated or looked for.