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A fire alarm annunciator panel is located where it is accessible to fire-fighting crews, such as at building entrances/exits. The annunciator panel will indicate the system status using lamps (or LEDs), an audible warning tone, and depending on the system technology, the exact location or approximate physical location of the source of a fire ...
A late 19th-century speaking trumpet used by firefighters A small sports megaphone for cheering at sporting events, next to a 3 in (8 cm) cigarette lighter for scale. From the Ancient Greek era to the nineteenth century, before the invention of electric loudspeakers and amplifiers, megaphone cones were used by people speaking to a large audience, to make their voice project more to a large ...
Announcement (computing), a message about a new software version Campaign announcement , a type of political speech Public service announcement , a media message in the public interest
A panel discussion, or simply a panel, involves a group of people gathered to discuss a topic in front of an audience, typically at scientific, business, or academic conferences, fan conventions, and on television shows. Panels usually include a moderator who guides the discussion and sometimes elicits audience questions, with the goal of being ...
1801: James Pillans, headmaster and geography teacher at the Old High School in Edinburgh, Scotland, is credited with inventing the first modern blackboard. [1]1925: George Brooks of Topeka, Kansas is issued a patent for the use of corkboard as a bulletin board which you could stick tacks into. [2]
A public service announcement (PSA) is a message in the public interest disseminated by the media without charge to raise public awareness and change behavior. Oftentimes these messages feature unsettling imagery, ideas or behaviors that are designed to startle or even scare the viewer into understanding the consequences of undergoing a particular harmful action or inaction (such as pictures ...
An announcement (ANN) is a Usenet, mailing list or e-mail message sent to notify subscribers that a software project has made a new release version. Newsgroup announcement recipients often have a name like "comp.somegroup.announce". Mailing list announcement recipients often have a name like "toolname-announce".
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