semaphore
An authentication system that uses something a user has in conjunction with something a user knows is called:
The type of alarm monitoring system that uses a bell or siren without a predictable response to the alarm is known as a "local alarm system." This system alerts the immediate area with a loud sound but does not automatically notify a monitoring service or law enforcement. As a result, the response to the alarm is dependent on individuals in the vicinity, rather than a coordinated response from authorities. Local alarms are often used for deterrence but lack the reliability of monitored systems.
The Homelink system uses top quality materials and craftsmanship which is always desirable. It also makes fast deliveries and allows for good and reliable connections to be established between vehicle and home.
VoIP is Voice Over Internet Protocol a telephone system that uses internet networks instead of telephone networks.
A predictive dialer is used to save time between phone calls for agents. It uses a formula to work out what numbers to dial from a data source, taking into account that some numbers will not be answered.
a matador.
The method of communication that uses two flags is called "flag signaling" or "flag semaphore." This system involves positioning the flags in specific angles to represent letters of the alphabet, allowing individuals to convey messages over distances. It is often used in maritime contexts for ship-to-ship communication or signaling to shore. Flag semaphore is an effective way to communicate visually without the need for sound.
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Its most customary meaning is 'signal light' or 'traffic light' such as those typically found at the corner of busy intersections in cities. However, it can also mean a flashing light communications system, or a communications system that uses flags.
I believe that you are thinking of the Dewey Decimal System.
The name the navy uses for the US Flag is the Ensign. They also fly a commissioning pennant from the highest point on the ship. And there are also signal flags used to communicate.
Goble distribution system
Binary
A gale warning is indicated by a specific flag system that uses two triangular flags. These flags are typically displayed one above the other, with the upper flag being red and the lower flag being white. This signaling is part of the maritime communication system to alert mariners of impending gale conditions.
bio nomenclature> a system to name plants
Driver.
Wikipedia Commons has pictures of all the world flags in SVG format, which mean that they can be stretched to any size and not pixelate. This is convenient for professional uses.