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R21, R-21 or R.21 may refer to:; In military. [1]

8 relations: Dichlorofluoromethane, HMAS Melbourne (R21), List of R-phrases, R-21 (missile), R21 (New York City Subway car), R21 (South Africa), Renault 21, USS R-21 (SS-98).


Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.

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Christmas and holiday season

The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.

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Christmas Eve

Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.

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Christmas traditions

Christmas traditions vary from country to country.

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Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon. It is a colorless and odorless gas. Its critical point is at 178.5 °C (451.7 K) and 5.17 MPa (51.7 bar). At temperatures from 5 K to 105 K it has one phase in the space group Pbca.

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HMAS Melbourne (R21)

HMAS Melbourne (R21) was a ''Majestic''-class light aircraft carrier of the Royal Australian Navy (RAN).

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List of R-phrases

R-phrases (short for risk phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations.

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New Year

New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.

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New Year's Day

New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.

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New Year's Eve

In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.

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R-21 (missile)

The R-21 (Р-21; NATO: SS-N-5 'Sark/Serb'; GRAU: 4K55) was a submarine-launched ballistic missile in service with the Soviet Union between 1963 and 1989.

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R21 (New York City Subway car)

The R21 was a New York City Subway car built by St. Louis Car Company from 1956 to 1957 for the IRT A Division.

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R21 (South Africa)

The R21 / P157 is a major north-south provincial route (with a freeway portion designated as a National Road) in eastern Gauteng Province, South Africa.

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Renault 21

The Renault 21 is a large family car produced by French automaker Renault between 1986 and 1994.

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USS R-21 (SS-98)

USS R-21 (SS-98) was an ''R''-class coastal and harbor defense submarine of the United States Navy.

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2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.

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2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.

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Redirects here:

R 21, R-21, R.21, R21 (disambiguation), R21 road.


[1] https://en.wikipedia.org/wiki/R21

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