Tier 4 (other)
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Tier 4 or Tier four may refer to: *Tier 4 COVID restrictions in England under
The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) Regulations 2020 The Health Protection (Coronavirus, Restrictions) (All Tiers) (England) Regulations 2020 (SI 2020/1374) is an English emergency statutory instrument that replaced the second lockdown regulations from 2 December 2020. As initially made, it bro ...
, the highest level *Level 4 COVID restrictions, in
COVID-19 pandemic in Scotland The COVID-19 pandemic in Scotland is part of the COVID-19 pandemic of coronavirus disease-2019, caused by the virus SARS-CoV-2. The first case of COVID-19 was confirmed in Scotland on 1 March 2020. Community transmission was first reported on ...
*Tier-4 COVID restrictions, in
COVID-19 pandemic in Wales The COVID-19 pandemic was confirmed to have spread to Wales on 28 February 2020, with a case being reported in the Swansea area; this first known case was a person who had recently returned from Italy. The first known case of community transm ...
*Tier IV, a
data center A data center (American English) or data centre (British English)See spelling differences. is a building, a dedicated space within a building, or a group of buildings used to house computer systems and associated components, such as telecommunic ...
standard *Tier 4 in
United States vehicle emission standards United States vehicle emission standards are set through a combination of legislative mandates enacted by Congress through Clean Air Act (CAA) amendments from 1970 onwards, and executive regulations managed nationally by the Environmental Protect ...


See also

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Multitier architecture In software engineering, multitier architecture (often referred to as ''n''-tier architecture) is a client–server architecture in which presentation, application processing and data management functions are physically separated. The most wide ...
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WTA Tier IV tournaments The WTA Tier IV tournaments were Women's Tennis Association fourth-level tournaments held from 1990 until the end of the 2008 season. The line-up of events varied over the years, with tournaments being promoted, demoted or cancelled. Some of the ...
, Women's Tennis Association tennis second-level tournaments *
Tier 1 (disambiguation) Tier 1 or Tier One may refer to: * Tier 1 capital, the core measure of a bank's financial strength * Tier 1 network, category of Internet backbone network * Scaled Composites Tier One, a suborbital human spaceflight program * Tier 1 nations in rug ...
*
Tier 2 (disambiguation) Tier 2 may refer to: * Tier 2 capital, constituents of a bank's capital requirement * Tier 2 network, a type of Internet service provider * Scaled Composites Tier Two, a human spaceflight program * Tier 2 in the First COVID-19 tier regulations in ...
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Tier 3 (disambiguation) Tier 3 may refer to: * Tier 3 (nightclub), in New York, U.S. * Tier 3 of the First COVID-19 tier regulations in England, the highest level * Tier 3 of the Second COVID-19 tier regulations in England * Tier 3 Railway lines in Australia * Tier III, ...
*
Tirefour Castle Tirefour Castle, (or Tirefour Broch, also spelled Tirfuir and Tirrefour) is an Iron Age broch located 4 kilometres north of Achnacroish on the island of Lismore, Scotland. Location Tirefour Castle () is situated on a rocky height on the east coa ...
, in Scotland {{disambig