Arsenous anhydride is a chemical compound with many synonyms based on the different names it is known by, such as arsenic trioxide, arsenious oxide, white arsenic, and arsenic sesquioxide, among others. This inorganic compound is used in many industrial processes, health and beauty products, and even in art. Some of the notable applications include its use in the manufacturing of glass, pigments, and pesticides. Additionally, in the medical field, arsenous anhydride is said to have antifungal and antibacterial properties and has been used as a treatment for some diseases. Due to its toxicity, it is essential to handle this compound with care and use appropriate safety measures.