Gold trioxide, also known as auric oxide or gold(III) oxide, is a compound composed of one gold atom and three oxygen atoms. This compound is a yellowish-brown powder that is highly reactive and unstable. Due to its unique properties, gold trioxide is commonly used in the electronics industry for the production of thin films and as a catalyst in various reactions. There are other terms used to refer to this compound, including auric trioxide, trisgold tetraoxide, and gold sesquioxide. These are all synonyms that have the same chemical composition and properties as gold trioxide.