Potassium nitrite is a chemical compound widely used in the food industry as a preservative and color fixative. However, there are other synonyms for this substance that people may encounter in different contexts. Some of the alternative names for potassium nitrite include nitrous acid potassium salt, saltpeter, nitrite of potash, and E249 (the food additive code assigned by the European Union). In addition to its use in food, potassium nitrite is also employed in the production of fertilizers, explosives, and other chemicals. Understanding the various synonyms for potassium nitrite can help individuals better comprehend its properties and wide-ranging applications.