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What (who) is X 680 - definition
YEAR
680 AD; 680 (year); Year 680; AD 680; 680 CE; Events in 680; Births in 680; Deaths in 680
![Byzantine–Bulgarian War]]: Army of [[Asparukh]] occupies the territory of current-day [[Bulgaria]].](https://commons.wikimedia.org/wiki/Special:FilePath/Balkans about 680 A.D., foundation of the First Bulgarian Empire.png?width=200 "Byzantine–Bulgarian War]]: Army of [[Asparukh]] occupies the territory of current-day [[Bulgaria]].")
680 BC
![black-figure]] [[hydria]] ([[Greece]])](https://commons.wikimedia.org/wiki/Special:FilePath/Chariot terma Staatliche Antikensammlungen 1452.jpg?width=200 "black-figure]] [[hydria]] ([[Greece]])")
The year 680 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 74 Ab urbe condita .
X (charge)
TERM IN PARTICLE PHYSICS
X charge; X-charge
In particle physics, the X charge (or simply X) is a conserved quantum number associated with the SO(10) grand unification theory. It is thought to be conserved in strong, weak, electromagnetic, gravitational, and Higgs interactions.
USS Melvin (DD-680)
 underway c1943.jpg?width=200)
FLETCHER-CLASS DESTROYER
DD680; DD-680; DD 680
USS Melvin (DD-680), a Fletcher-class destroyer and the second ship of the United States Navy to be named for Lieutenant, junior grade John T. Melvin (1887–1917), who was killed on 5 November 1917 while serving on the USS Alcedo in World War I and is recognized as the first American naval officer to die in that war.
Wikipedia
680
Year 680 (DCLXXX) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 680 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
