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Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the triggering radar, providing range, bearing and ...
4L [3] 4L-AAA to 4L-ZZZ. 4L-10000 to 4L-99999. Germany. D [3] D-AAAA to D-AZZZ for aircraft with more than 20 t MTOW. D-AUAA to D-AZZZ (test registrations) for aircraft manufactured by Airbus at Finkenwerder. D-BAAA to D-BZZZ for aircraft with 14–20 t MTOW. D-CAAA to D-CZZZ for aircraft with 5.7–14 t MTOW.
In many countries, dialing either 112 (used in Europe and parts of Asia) or 911 (used mostly in the Americas) will connect callers to the local emergency services. Some countries use other emergency telephone numbers, sometimes also depending on the emergency service. The emergency numbers in the world (but not necessarily all of them) are listed below.
Scams are becoming more and more prevalent. Here's a list of scammer phone numbers and area codes to avoid answering if you don't know exactly who's calling.
Country calling codes, country dial-in codes, international subscriber dialing ( ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
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^ The number of digits that allow to uniquely identify a number within the country. It excludes the country code and any trunk code or access code. It includes the mobile prefix towards the total number of digits.
The North American Numbering Plan Administration has divided the state of New York into twelve numbering plan areas (NPAs) with a total of 19 area codes.
A reverse telephone directory (also known as a gray pages directory, criss-cross directory or reverse phone lookup) is a collection of telephone numbers and associated customer details. However, unlike a standard telephone directory, where the user uses customer's details (such as name and address) in order to retrieve the telephone number of that person or business, a reverse telephone ...
The Rayleigh number is defined as the product of the Grashof number ( Gr ), which describes the relationship between buoyancy and viscosity within a fluid, and the Prandtl number ( Pr ), which describes the relationship between momentum diffusivity and thermal diffusivity: Ra = Gr × Pr. [4] [3] Hence it may also be viewed as the ratio of buoyancy and viscosity forces multiplied by the ratio ...