Call signs in North America are frequently still used by North American broadcast stations in addition to amateur radio and other international radio stations that continue to identify by call signs around the world. Each country has a different set of patterns for its own call signs.
Many countries have specific conventions for classifying call signs by transmitter characteristics and location. The call sign format for radio and television call signs follows a number of conventions. All call signs begin with a "prefix" assigned by the International Telecommunications Union. For example, the United States has been assigned the following prefixes: AAA–ALZ, K, N, W. For a complete list, see international call sign allocations.
... In financial mathematics, put–call parity defines a relationship between the price of a European call option and European put option in a frictionless ... Put–call parity requires minimal assumptions and thus does not require assumptions such as those of Black–Scholes or other commonly used financial models ...
... Call signs are also used in other parts of the world, particularly those which have had significant U.S ... Another well-known call sign outside of the region is HCJB in Ecuador, and several radio time sources used to set radio clocks or for audible listening, such as CHU in Ottawa, Ontario ...
... If a caller in the USA or Canada wants to call the Mayor of Dunedin, New Zealand, they would dial 477. 4000 ... The generic international call prefix for NANPA countries is 011, then the country code for New Zealand is 64, the area code for Dunedin is 3, and ... If a caller in Japan wants to call the same number, they would instead dial 477. 4000 ...
... Call (band) Call, Texas, a community in the southern United States. ...
... A caller who possesses no means of payment may have the phone company's operator ask the call recipient if the recipient is willing to make payment for the call this is known as "reversing the charges", "reverse ... It is also possible to place a call to a phone booth if the intended recipient is known to be waiting at the booth, however not all phone booths allow incoming calls ...
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—Herman Melville (18191891)
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—Franklin D. Roosevelt (18821945)
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—Henry David Thoreau (18171862)
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—Abbey Lincoln (b. 1930)