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Tap code. The tap code, sometimes called the knock code, is a way to encode text messages on a letter-by-letter basis in a very simple way. The message is transmitted using a series of tap sounds, hence its name. [ 1] The tap code has been commonly used by prisoners to communicate with each other. The method of communicating is usually by ...
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
Analog of the Japanese Type B Cipher Machine (codenamed Purple) built by the U.S. Army Signal Intelligence Service Purple analog in use. In the history of cryptography, the "System 97 Typewriter for European Characters" (九七式欧文印字機 kyūnana-shiki ōbun injiki) or "Type B Cipher Machine", codenamed Purple by the United States, was an encryption machine used by the Japanese Foreign ...
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This classification scheme takes the form of a letter followed by a number (or, in the case of some "X" stations, more numbers). [50] The letter indicates the language used by the station in question: E indicates a station broadcasting in English. G indicates a station broadcasting in German. S indicates a station broadcasting in a Slavic language.
There are 21 letters in the script; one letter appears with or without a diacritic dot. Dee mapped these letters of the "Adamical alphabet" onto 22 of the letters of the English alphabet, treating U and V as positional variants (as was common at the time) and omitting the English letters J, K, and W. [ b ] The Enochian script is written from ...
Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.
The State Department moved several times throughout the capital in the ensuing decades, including six buildings in September 1800; [52] the War Office Building west of the White House the following May; [53] the Treasury Building once more from September 1819 to November 1866; [54] [note 2] [53] the Washington City Orphan Home from November ...