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  2. National Special Security Event - Wikipedia

    en.wikipedia.org/.../National_Special_Security_Event

    A National Special Security Event (NSSE) is an event of national or international significance deemed by the United States Department of Homeland Security (DHS) to be a potential target for terrorism or other criminal activity. These events have included summits of world leaders, meetings of international organizations, presidential nominating ...

  3. Ceremony - Wikipedia

    en.wikipedia.org/wiki/Ceremony

    Ceremony. Ceremonial at court during Prinsjesdag. A ceremony ( UK: / ˈsɛrəməni /, US: / ˈsɛrəˌmoʊni /) is a unified ritualistic event with a purpose, usually consisting of a number of artistic components, performed on a special occasion. The word may be of Etruscan origin, via the Latin caerimonia. [ 1]

  4. List of observances in the United States by presidential ...

    en.wikipedia.org/wiki/List_of_observances_in_the...

    The policy of issuing proclamations calling for the observance of special days or events is in 1 CFR Section 19.4, which allows for the responsibility for the preparation and presentation of proposed proclamations calling for the observance of special days, or events to the Director of Management and Budget to such agencies as deemed appropriate.

  5. Special Olympics - Wikipedia

    en.wikipedia.org/wiki/Special_Olympics

    Special Olympics is the world's largest sports organization for children and adults with intellectual disabilities providing year-round training and activities to 5 million participants and Unified Sports partners in 172 countries. [ 2] Special Olympics competitions are held daily, all around the world—including local, national and regional ...

  6. List of severe weather phenomena - Wikipedia

    en.wikipedia.org/wiki/List_of_severe_weather...

    Cold drop ( Spanish: gota fría; archaic as a meteorological term), colloquially, any high impact rainfall event along the Mediterranean coast of Spain. Drought, a prolonged water supply shortage, often caused by persistent lack of, or much reduced, rainfall. Floods. Flash flood. Rainstorm. Red rain in Kerala (for related phenomena, see Blood rain)

  7. Black swan theory - Wikipedia

    en.wikipedia.org/wiki/Black_swan_theory

    Black swan theory. The black swan theory or theory of black swan events is a metaphor that describes an event that comes as a surprise, has a major effect, and is often inappropriately rationalized after the fact with the benefit of hindsight. The term is based on a Latin expression which presumed that black swans did not exist.

  8. Relativity of simultaneity - Wikipedia

    en.wikipedia.org/wiki/Relativity_of_simultaneity

    In physics, the relativity of simultaneity is the concept that distant simultaneity – whether two spatially separated events occur at the same time – is not absolute, but depends on the observer's reference frame. This possibility was raised by mathematician Henri Poincaré in 1900, and thereafter became a central idea in the special theory ...

  9. List of month-long observances - Wikipedia

    en.wikipedia.org/wiki/List_of_month-long_observances

    The following is a list of notable month-long observances, recurrent months that are used by various governments, groups and organizations to raise awareness of an issue, commemorate a group or event, or celebrate something.