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{{wiktionary|-tun|TUN|Tun|tun}}
'''TUN''' or '''tun''' may refer to:
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==Biology==
* Tun shells, large sea snails of the family ''[[Tonnidae]]''
* Tun, a [[tardigrade]] in its cryptobiotic state
* Tun or Toon,  common name for trees of the genus ''[[Toona]]''

==Places==
* [[Tun, Sweden]], a locality in Västra Götaland County
* Tūn or Toon, the former name of [[Ferdows]], a city in Iran
* [[Touro University Nevada]], a private university in Henderson, Nevada, United States
* [[Tunisia]], ISO 3166-1 alpha-3 country code
* [[Tunis–Carthage International Airport]], (IATA airport code: TUN)
* [[Old English]] meaning town. Often used as a suffix in its Romanised form  (''~ton'') e.g.: Southamp<u>ton</u>

==Measurement and time==
* [[Tun (Maya calendar)]], a unit of 360 days on the Maya calendar
* [[Tun (unit)]], an antiquated measurement of liquid

==Science and technology==
* [[TUN/TAP]], a computer network device driver
* [[TUN (product standard)]], Danish building materials numbering system

==Other uses==
* [[Brilliance Tun]], a 2014–2015 Chinese city car
* Tun, an honorific [[Malay titles#Tun|Malay title]]
* Tun, a type of cask ([[barrel]]) with a capacity of 252 wine gallons (954 litres)
** [[Lauter tun]], a vessel used in brewing
** [[Mash tun]], a vessel used in brewing

==See also==
* [[Ton (disambiguation)]]

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