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  2. Restricted area - Wikipedia

    en.wikipedia.org/wiki/Restricted_Area

    An area that only authorized people can enter; see also exclusion zone Restricted area , a zone within the key of a basketball court A departure area after the customs counters in most airports

  3. File:Singapore Road Signs - Warning Sign - Restricted Zone ...

    en.wikipedia.org/wiki/File:Singapore_Road_Signs...

    This logo image consists only of simple geometric shapes or text. It does not meet the threshold of originality needed for copyright protection, and is therefore in the public domain. Although it is free of copyright restrictions, this image may still be subject to other restrictions.

  4. Safety sign - Wikipedia

    en.wikipedia.org/wiki/Safety_sign

    Safety sign standards are regulated by Japanese Industrial Standards through standards JIS Z9101 (Workplace and public area safety signs) JIS Z 9103 (Safety sign colors) and JIS Z 9104 (Safety signs - General specifications). While design trends have been moving towards international norms of ISO standards, differences are still present such as ...

  5. Restricted military area - Wikipedia

    en.wikipedia.org/wiki/Restricted_military_area

    Restricted since Note Image Area 51: United States: 1955 Acquired initially in 1955 by the USAF and CIA for the purpose of flight testing Lockheed U-2 aircraft Brdy: Czech Republic: 1925 Range of hills, mostly covered by forest Penhale Sands: United Kingdom: 1939 The restricted military area, Penhale Camp, is found on the northern part of the ...

  6. Military exclusion zone - Wikipedia

    en.wikipedia.org/wiki/Military_exclusion_zone

    A military exclusion zone (MEZ) is an area in the immediate vicinity of a military action established by a country to prevent the unauthorized entry of civilian personnel/equipment for their own safety or to protect natural assets already in place in the zone. It is also established to prevent an enemy from acquiring any material which could ...

  7. No symbol - Wikipedia

    en.wikipedia.org/wiki/No_symbol

    The general prohibition sign, [1] also known informally as the no symbol, 'do not' sign, circle-backslash symbol, nay, interdictory circle, prohibited symbol, don't do it symbol, or universal no, is a red circle with a 45-degree diagonal line inside the circle from upper-left to lower-right. It is typically overlaid on a pictogram to warn that ...

  8. Piggybacking (security) - Wikipedia

    en.wikipedia.org/wiki/Piggybacking_(security)

    No Tailgating sign at Apple Inc. office. In security, piggybacking, similar to tailgating, refers to when a person tags along with another person who is authorized to gain entry into a restricted area, or pass a certain checkpoint. [1] It can be either electronic or physical. [2]

  9. Security identification display area - Wikipedia

    en.wikipedia.org/wiki/Security_identification...

    Security Identification Display Area, or SIDA, is a special security area designated by an airport operator in the US to comply with Transportation Security Administration (TSA) requirements in CFR 49 1542.205. An identification system must be used in this area.

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