19 Call signs

Air Force One is the official air traffic control call sign for a United States Air Force aircraft carrying the president of the United States. In common parlance, the term is used to denote US Air Force aircraft modified and used to transport the president and a metonym for the primary presidential aircraft, VC-25, although it can be used to refer to any Air Force aircraft the president travels on.

Air Force Two is the air traffic control call sign held by any United States Air Force aircraft carrying the U.S. vice president, but not the president. The term is often associated with the Boeing C-32, a modified 757 which is most commonly used as the vice president's transport. Other 89th Airlift Wing aircraft, such as the Boeing C-40 Clipper, C-20B, C-37A, and C-37B have served in this role as well. The VC-25A, the aircraft most often used by the president as Air Force One, has also been used by the vice president as Air Force Two.

Air India One is the call sign of any aircraft with the President of India or Vice President of India & the Prime Minister of India on board. The aircraft is operated as a special mission flight by the Indian Air Force (IAF). The IAF's Air Headquarters Communication Squadron, based at Indira Gandhi International Airport in New Delhi, is the unit responsible for coordinating Air India One missions.

Army One is the callsign of any United States Army aircraft carrying the president of the United States. From 1957 until 1976, this was usually an Army helicopter transporting the president. Prior to 1976, responsibility for helicopter transportation of the president was divided between the Army and the U.S. Marine Corps until the Marine Corps was given the sole responsibility of transporting the president by helicopter.

Aviation call signs are communication call signs assigned as unique identifiers to aircraft.

Coast Guard One is the call sign of any United States Coast Guard aircraft carrying the president of the United States. Similarly, any Coast Guard aircraft carrying the vice president is designated Coast Guard Two.

Code One is the name of the Republic of Korea Air Force aircraft which carries the President of South Korea. The current aircraft used as Code One is a Boeing 747-400 leased from Korean Air.

Cotam Unité is the official air traffic control call sign of any French Air Force aircraft carrying the President of France. From the 1960s to 1994, COTAM was the acronym for the French Air Force's Military Air Transport Command. In November 2010, the Governmental transport squadron received a newly refurbished Airbus A330 ordered by the government to be used as the presidential aircraft replacing 2 Airbus A319. ETEC 65 also has the following aircraft for VIP transport:2 Falcon 7X 2 Falcon 900, 4 Falcon 50, 7 TBM 700, 3 Super Puma helicopters.

DCF77 is a German longwave time signal and standard-frequency radio station. It started service as a standard-frequency station on 1 January 1959. In June 1973 date and time information was added. Its primary and backup transmitter are located at 50°0′56″N 9°00′39″E in Mainflingen, about 25 km south-east of Frankfurt am Main, Germany. The transmitter generates a nominal power of 50 kW, of which about 30 to 35 kW can be radiated via a T-antenna.

The Indonesian Presidential Aircraft, also known as Indonesia One with a serial number A-001 is the presidential aircraft carrying the president and vice president of Indonesia. The aircraft was designed to meet the specific safety and security standards to support the VVIP air transportation needs of the Indonesian president, and includes a high-end self-defense system.

Marine One is the call sign of any United States Marine Corps aircraft carrying the president of the United States. It usually denotes a helicopter operated by Marine Helicopter Squadron One (HMX-1) "Nighthawks", consisting of either the large Sikorsky VH-3D Sea King or the newer, smaller VH-60N "White Hawk". Both helicopters are called "White Tops" because of their livery. Any Marine Corps aircraft carrying the vice president without the president has the call sign Marine Two.

Maritime call signs are call signs assigned as unique identifiers to ships and boats. All radio transmissions must be individually identified by the call sign. Merchant and naval vessels are assigned call signs by their national licensing authorities.

Navy One is the call sign of any United States Navy aircraft carrying the president of the United States.

The Time from NPL is a radio signal broadcast from the Anthorn Radio Station near Anthorn, Cumbria, which serves as the United Kingdom's national time reference. The time signal is derived from three atomic clocks installed at the transmitter site, and is based on time standards maintained by the UK's National Physical Laboratory (NPL) in Teddington. The service is provided by Babcock International, under contract to the NPL. It was funded by the former Department for Business, Innovation and Skills; as of 2017 NPL Management Limited (NPLML) was owned by the Department for Business, Energy and Industrial Strategy (BEIS), and NPL operated as a public corporation.

WEVD was an American brokered programming radio station with some news-talk launched in August 1927 by the Socialist Party of America. Making use of the initials of recently deceased party leader Eugene Victor Debs in its call sign, the station operated from Woodhaven in the New York City borough of Queens. The station was purchased with a $250,000 radio fund raised by the Socialist Party in its largest fundraising effort of the 1920s and was intended as spreading progressive ideas to a mass audience. A number of national trade unions and other institutions aided the Socialists in obtaining the station.