B40

Etymology
Short for bottom 40 percent, a portion of Malaysia's population.

Noun

 * 1) A household with a household income below 4,850 Malaysian ringgit per month.
 * 2) A person from such a household.

Coordinate terms

 * , middle-income Malaysian households
 * , top-income Malaysian households

Etymology
Short for + 40, referring to the barrel caliber in millimeters.

Noun

 * 1)  rocket-propelled grenade, specifically the RPG-2