What does the term "mercantile burglar alarm" refer to?

The term "mercantile burglar alarm" specifically refers to a commercial alarm system. This type of alarm is designed for businesses, retail establishments, and other commercial properties to protect against theft and unauthorized entry.

Commercial alarm systems often include various components such as motion detectors, door and window sensors, and sirens, all tailored to meet the unique needs of a business environment. Unlike residential systems, which are focused on protecting homes, mercantile systems are meant to safeguard larger spaces where valuable inventory and assets are stored.

The other options represent different types of alarm systems that cater to specific environments, such as residential for homes, government buildings, and industrial facilities, but they do not encompass the broad applications covered by mercantile systems.