What are commonly known as cigarette match combinations in terms of safety?

Cigarette match combinations refer specifically to devices designed to minimize the risk of fire caused by smoking materials such as cigarettes. These devices are typically designed to extinguish lit cigarettes or matches safely, thereby preventing accidental ignition of flammable materials.

Timing devices serve as an essential safety feature in various applications but in this context, they relate best to managing the timing of actions taken to mitigate fire risks associated with smoking. A timing device can ensure that a cigarette is extinguished by a particular time or after a set duration, preventing it from being left unattended and potentially causing a fire.

Other options describe general safety equipment or systems, but they do not specifically address the particular function of managing the risks associated with smoking materials as directly as timing devices do. The context of "cigarette match combinations" necessitates a focus on precise timing mechanisms to enhance safety. This makes timing devices the most appropriate choice in relation to the question.