Opera hat characteristic snapping sound heard upon opening a gibus suggested a third name, the "chapeau claque", "claque" being the French word for "slap". Opera hat An opera hat, also called a chapeau claque or gibus, is a top hat variant that is collapsible through a spring system, originally intended for less spacious venues, such as theatre and opera visits. Typically made of satin in black colour, its advantage is that it folds vertically through a push or a snap on the top of the hat, in order to be conveniently stored in a wardrobe or under the seat. Invertably, it opens
Top Hat (company) Top Hat (company) Top Hat is a Canadian educational software company with its headquarters in Toronto, Ontario, Canada, and a second office in Sydney, Australia. Top Hat hosts a library of interactive college textbooks that students read on their mobile devices, and a platform designed for teachers to check attendance with additional products for student engagement, assignments and activities. Students pay to use the app per semester or over longer periods, and universitywide licences are also available. Co-founders Mike Silagadze and Mohsen Shahini started Top Hat in 2009 in Waterloo, Ontario, to tackle problems with student concentration and mobile devices