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Q and Z signals are brevity codes widely used in Morse code radio telegraphy. See, respectively: Q code.
Wigwag flags, wigwag torches and kerosene canteen, and a signal rocket. Wigwag (more formally, aerial telegraphy) is an historical form of flag signaling that passes messages by waving a single flag. It differs from flag semaphore in that it uses one flag rather than two, and the symbols for each letter are represented by the motion of the flag ...
WHCU. / 42.46500°N 76.37306°W / 42.46500; -76.37306. WHCU (870 AM) is a commercial radio station in Ithaca, New York, that programs a news/talk radio format. The station has been owned by Saga Communications, operating as part of its Cayuga Radio Group, since 2005. The studios and offices are on Hanshaw Road in Ithaca.
Signal lamp. A signal lamp (sometimes called an Aldis lamp or a Morse lamp [1]) is a visual signaling device for optical communication by flashes of a lamp, typically using Morse code. The idea of flashing dots and dashes from a lantern was first put into practice by Captain Philip Howard Colomb, of the Royal Navy, in 1867.
File:International Morse Code.svg. Size of this PNG preview of this SVG file: 414 × 530 pixels. Other resolutions: 187 × 240 pixels | 375 × 480 pixels | 600 × 768 pixels | 800 × 1,024 pixels | 1,600 × 2,048 pixels. Original file (SVG file, nominally 414 × 530 pixels, file size: 9 KB) This is a file from the Wikimedia Commons.
Morse homology. In mathematics, specifically in the field of differential topology, Morse homology is a homology theory defined for any smooth manifold. It is constructed using the smooth structure and an auxiliary metric on the manifold, but turns out to be topologically invariant, and is in fact isomorphic to singular homology.
The Q-code is a standardised collection of three-letter codes that each start with the letter "Q". It is an operating signal initially developed for commercial radiotelegraph communication and later adopted by other radio services, especially amateur radio. To distinguish the use of a Q-code transmitted as a question from the same Q-code ...
Ten-code. Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by law enforcement and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]