84 (eighty-four) is the natural number following 83 and preceding 85. 84 is: the sum of the first seven triangular numbers (making it a tetrahedral number). the sum of a twin prime (41 + 43). a semiperfect number, being thrice a perfect number. a palindromic number and a repdigit in bases 11 (7711), 13...
U.S. Route 84 (US 84) is an east–west U.S. Highway. It started as a short Georgia–Alabama route in the original 1926 scheme, but by 1941 it had been extended all the way to Colorado. The highway's eastern terminus is a short distance east of Midway, Georgia, at an interchange with Interstate 95.
The M-84 is a Yugoslav third generation main battle tank, a variant of the Soviet T-72. The M-84 is still in service in Serbia, Kuwait, Croatia, and Slovenia, and other countries such as Bosnia and Herzegovina use a minimal number.
The Republic F-84 Thunderjet was an American turbojet fighter-bomber aircraft. Originating as a 1944 United States Army Air Forces (USAAF) proposal for a "day fighter", the F-84 first flew in 1946. Although it entered service in 1947...
The Nakajima Ki-84 Hayate (キ84 疾風"Gale") was a single-seat fighter flown by the Imperial Japanese Army Air Service in the last two years of World War II. The Allied reporting name was "Frank"; the Japanese Army designation was Army Type 4 Fighter (四式戦闘機 yon-shiki-sentō-ki).
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The T-84 is a Ukrainian main battle tank (MBT), a development of the Soviet T-80 main battle tank. It was first built in 1994 and entered service in the Ukrainian Armed Forces in 1999. The T-84 is based on the diesel-engined T-80 version, the T-80UD.