noun: (countable, plural "BGAs") Initialism of ball grid array. [(electronics) A type of surface mount used to connect integrated circuits to printed circuit boards.]
noun: (uncountable, countable, plural "BGA") Initialism of blue-green alga. [Any member of the taxonomic class or phylum Cyanobacteria; a primitive photosynthetic organism similar to bacteria which is thought to have generated the first oxygen in the Earth's atmosphere.]