What is ADT an acronym for, ADT stands for American District Telegraph. The company was founded in 1874 as American District Telegraph Company in New York City, originally providing telegraph services to deliver messages. In early 1900s, ADT shifted from telegraph to security systems, using telegraph wires to provide burglar alarm monitoring for businesses and homes, becoming first home security monitoring company in United States. The original American District Telegraph name referred to telegraph district messenger service that delivered messages within districts. Over time, company became known simply as ADT Security, now officially just ADT Inc. Many people mistakenly think ADT stands for something like Advanced Detection Technology or Alarm Detection Technology, but official historical meaning is American District Telegraph. The company has expanded to provide fire alarms, home automation, video surveillance, and smart home integration. Despite name change, legacy acronym remains well known brand in security industry, traded on NYSE as ADT, serving over 6 million customers in US.
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