A Tannoy is a system of loudspeakers used to make public announcements, for example at a fair or at a sports stadium. a system for giving out information in public places using loudspeakers over the tannoy
() A genericised trademark of Tannoy Ltd, a manufacturer of public address systems. "Tannoy" is a syllabic abbreviation of tantalum alloy, which was the material used in a type of electrolytic rectifier developed by the company.