acid in Wingdings is ♋︎♍︎♓︎♎︎

One of a class of compounds, generally but not alwaysdistinguished by their sour taste, solubility in water, and reddeningof vegetable blue or violet colors. They are also characterized bythe power of destroying the distinctive properties of alkalies orbases, combining with them to form salts, at the same time losingtheir own peculiar properties. They all contain hydrogen, united witha more negative element or radical, either alone, or more generallywith oxygen, and take their names from this negative element orradical. Those which contain no oxygen are sometimes called hydracidsin distinction from the others which are called oxygen acids oroxacids.