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) they witnessed while studying at the University of Waterloo. Early on, the company’s sales approach involved selling directly to academic administration "who had little incentive or interest in changing the way students access course materials," according to Silagadze. The firm changed its tactics to sell directly to educators, a strategy that,according to the company, has resulted in more than two million student subscribers across North America and beyond. The company claims that they are used in over 1000 universities. , Top Hat charges no platform fees for students when their professors assign Open Educational Resources. In 2017, Top Hat was