What is another word for double convex?
Pronunciation: [dˈʌbə͡l kɒnvˈɛks] (IPA) 
Double convex refers to a shape with two convex curvatures. Some synonyms for double convex include biconvex, plano-convex, and meniscus. The term biconvex is used in optics to refer to a lens with two convex surfaces that bulge outwards. Plano-convex refers to a shape with one flat surface and one convex surface, commonly used in lenses and mirrors. Meniscus is a term used to describe a lens or mirror with one surface that is convex and one surface that is concave, creating a crescent shape. These synonyms are often used interchangeably in the field of optics and geometry.
