Why is it called Gears of War?

I'm curious to understand the origin of the name 'Gears of War'. Could it be related to some specific element within the game's storyline or mechanics? Does the title allude to a specific conflict or war scenario? Or perhaps, is it a metaphorical reference to the players' struggle and perseverance in the game? It seems like an intriguing title with layers of meaning, and I'm eager to delve deeper into its inspiration and significance. Could you elaborate on the reasoning behind this unique moniker?