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Some have alarms activated when they are opened, to alert staff of unauthorized use during non-emergencies. [8] On many exits, the user may have to push against a crash bar or other door opening device for a period of time to unlock the door. Many exits have a sign reading, "Emergency exit only, alarm will sound if opened", to warn of the fact ...
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.
In multiple cases, a do not disturb sign on the door of a hotel room has been blamed for concealing a homicide, suspicious death, or other criminal activity. [3] [4] [5]In 2009, a do not disturb sign was blamed for concealing the disappearance of an elderly couple on a cruise ship.
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Wet floor signs are also intended to avoid legal liability from injury due to failing to warn of an unsafe condition. [17] They are usually yellow. [18] The warning is sometimes enhanced with new technology to provide audible warnings. [19] Robotic cleaning equipment can use wet floor signs with sonar gadgetry to know when its job is finished. [20]
Feminine ordinal indicator, Degree sign: −: Minus sign: Hyphen-minus, Commercial minus: ×: Multiplication sign: X mark # Number sign: Numero sign. Also known as "octothorpe", "hash" and "hashtag sign" Pound sign № Numero sign: Number sign: Obelus: Division sign, Dagger, Commercial minus, Index ( ) Parenthesis: Bracket, Angle bracket ...
A door knocker is an item of door furniture that allows people outside a house or other dwelling or building to alert those inside to their presence. A door knocker has a part fixed to the door, and a part (usually metal) which is attached to the door by a hinge, and may be lifted and used to strike a plate fitted to the door, or the door itself, making a noise.
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