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2. Radar beacon - Wikipedia

   en.wikipedia.org/wiki/Radar_beacon

   Radar beacon. Racon signal as seen on a radar screen. This beacon receives using sidelobe suppression and transmits the letter "Q" in Morse code near Boston Harbor (Nahant) 17 January 1985. Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1 ...

3. McDonnell Douglas F-15 Eagle - Wikipedia

   en.wikipedia.org/wiki/McDonnell_Douglas_F-15_Eagle

   The McDonnell Douglas F-15 Eagle is an American twin-engine, all-weather fighter aircraft designed by McDonnell Douglas (now part of Boeing).Following reviews of proposals, the United States Air Force (USAF) selected McDonnell Douglas's design in 1969 to meet the service's need for a dedicated air superiority fighter.

4. 2016 United States presidential election - Wikipedia

   en.wikipedia.org/wiki/2016_United_States...

   President Barack Obama ordered a "full review" into such possible intervention. [299] Director of National Intelligence James R. Clapper in early January 2017 testified before a Senate committee that Russia's meddling in the 2016 presidential campaign went beyond hacking, and included disinformation and the dissemination of fake news , often ...

5. Number - Wikipedia

   en.wikipedia.org/wiki/Number

   In mathematics, the notion of number has been extended over the centuries to include zero (0), [3] negative numbers, [4] rational numbers such as one half (), real numbers such as the square root of 2 and π, [5] and complex numbers [6] which extend the real numbers with a square root of −1 (and its combinations with real numbers by adding or ...

6. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and mathematics itself. There are many areas of mathematics, which include number theory (the study of numbers), algebra (the study of formulas and related structures), geometry (the study ...

7. United States dollar - Wikipedia

   en.wikipedia.org/wiki/United_States_dollar

   This is an accepted version of this page This is the latest accepted revision, reviewed on 2 October 2024. Currency of the United States "USD" redirects here. For other uses, see USD (disambiguation). United States dollar Federal Reserve Notes (obverse) ISO 4217 Code USD (numeric: 840) Subunit 0.01 Unit Symbol $, US$, U$ ‎ Nickname List Ace, bean, bill, bone, buck, deuce, dough, dub, ducat ...

8. Natural number - Wikipedia

   en.wikipedia.org/wiki/Natural_number

   The first ordinal number that is not a natural number is expressed as ω; this is also the ordinal number of the set of natural numbers itself. The least ordinal of cardinality ℵ 0 (that is, the initial ordinal of ℵ 0 ) is ω but many well-ordered sets with cardinal number ℵ 0 have an ordinal number greater than ω .

9. Time (magazine) - Wikipedia

   en.wikipedia.org/wiki/Time_(magazine)

   From 1942 until 1979, Time had a Canadian edition that included an insert of five pages of locally produced content and occasional Canadian covers. Following changes in the tax status of Canadian editions of American magazines, Time closed Canadian bureaus, except for Ottawa , and published identical content to the US edition but with Canadian ...