This key originates from the mid 19th century, when telegraphs were used for long distance communication. The original Break key could be used to break the circuit, allowing one side of the telegraph conversation to let the other know they needed to send a message. This has evolved over the years, especially with the move to computers, and the reason you might not immediately know why this key exists is that its functionality has mostly been moved to other keys in recent years. For example,...
