Sodium bicarbonate (usually baking soda).
Sodium carbonate (usually washing soda).
Sodium in chemical combination.
Carbonated water (water impregnated with pressurised carbon dioxide, originally made with sodium bicarbonate).
(especially in the northeast) Any carbonated (usually sweet) soft drink.
(especially in the northeast) A glass, bottle or can of this drink.
The first card in the dealing box in the game of faro, which is discarded to leave 51 cards in play.