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  2. Exit sign - Wikipedia

    en.wikipedia.org/wiki/Exit_sign

    The signs often have metal or plastic knock-outs which can optionally be removed so that an arrow is also lit pointing left or right. Modern exit signs are often combined with other safety devices, such as emergency floodlighting for supplementary area illumination. [13] Modern exit signs are also, to some degree, flame retardant.

  3. ISO 7010 - Wikipedia

    en.wikipedia.org/wiki/ISO_7010

    Shape and colour of sign types Sign type [1] Meaning Colour (per ISO 3864-4) [7] Shape [7] Example Prohibition sign: Must not do: Red: Circle with diagonal line: No open flame Mandatory sign: Must do: Blue: Circle: Use hearing protection Warning sign: Warn of hazard: Yellow: Equilateral triangle with rounded corners: Explosive materials Safe ...

  4. Please - Wikipedia

    en.wikipedia.org/wiki/Please

    "Please" is a shortening of the phrase, if you please, an intransitive, ergative form taken from if it please you, which is in turn a calque of the French s'il vous plaît, which replaced pray. The exact time frame of the shortening is unknown, though it has been noted that this form appears not to have been known to William Shakespeare , for ...

  5. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    A pet door (also known as a cat flap or dog door) is an opening in a door to allow pets to enter and exit without the main door's being opened. It may be simply covered by a rubber flap, or it may be an actual door hinged on the top that the pet can push through.

  6. Stop sign - Wikipedia

    en.wikipedia.org/wiki/Stop_sign

    The MUTCD stop sign was already widely deployed in the United States when the use of other types of stop signs was eliminated in 1966. [11] In 1968, this sign was adopted by the Vienna Convention on Road Signs and Signals as part of United Nations Economic Commission for Europe 's effort to standardize road travel across borders.

  7. Emergency exit - Wikipedia

    en.wikipedia.org/wiki/Emergency_exit

    Emergency exit in Universitetet metro station in Stockholm. An emergency exit in a building or other structure is a special exit used during emergencies such as fires.The combined use of regular and emergency exits allows for faster evacuation, and emergency exits provide alternative means of evacuation if regular exits are inaccessible.