The term 'Type of Glass' can refer to two different types of glass: STAINED glass and OPAL glass. STAINED glass is a type of colored glass that has been decorated with metallic oxides, which gives it a unique and colorful appearance. It is often used in churches and other religious buildings, as well as in decorative windows and lamps. OPAL glass, on the other hand, is a type of glass that has been treated with a special coating to give it an iridescent, milky appearance. It is often used in jewelry and other decorative items.