The International Telecommunications Union (ITU), based in Geneva, Switzerland is an international organisation set up to regulate and coordinate broadcasting and telecommunications in its member countries.
Most, but not all, countries in the world are members of the ITU. Representatives of the ITU member nations meet regularly at Conventions to review and draw up technical standards, radio regulation rules and frequency allocation policies.
A subsidiary of the ITU, the International Frequency Regulation Board (IFRB) actually decides which countries are to be allocated specific frequencies and monitors the use of those allocations.
HOLD Noun - cavity in a ship below deck where cargo is stowed. Also the area used to house transmitters on many radio ships.