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A replica of a Chappe telegraph tower (18th century). A 'semaphore telegraph', also called a 'semaphore line', 'optical telegraph', 'shutter telegraph chain', 'Chappe telegraph', or 'Napoleonic semaphore', is a system used for conveying information by means of visual signals, using towers with pivoting arms or shutters, also known as blades or paddles.
"Triple-product" business model of digital media platforms. [7]Digital media platforms like YouTube work through a triple-product business model in which platforms provide information and entertainment (infotainment) to the public often at no cost, while simultaneously capturing their attention, and also collecting user data to sell to advertisers. [7]
The COVID-19 pandemic in Indonesia is part of the worldwide pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).