"White knobs" typically refers to a slang term used to describe wealthy or influential people who are seen as entitled and showing off their privileged status. Full definition
2 Install white knobs to ensure the hardware doesn't compete with the wallpaper. (styleathome.com)
I added the new white knobs, which create a subtle contrast to the soft blue. (sawnailandpaint.com)
Black and white Moroccan mosaic floor tiles lead to a stunning black washstand complemented with black star cabinet doors contrasted with white knobs and an ivory quartz countertop paired with an ivory quartz backsplash fixed behind a satin nickel gooseneck faucet. (decorpad.com)