The two black and white stripes running across the flag symbolise the two chief ministers who assist the state. It's interesting how the stable, monarch-centred system of governance is expressed in the flag's design.

Brunei is well-known as an oil-rich nation, giving it the image of a 'small, wealthy country in Southeast Asia.' You can also use it metaphorically when talking about prosperity or a stable life. Of course, its primary use is for talking about travelling to or the culture of Brunei.