The sound comes from recordings of the Reloj Monumental de Pachuca, the landmark clock tower in the centre of Pachuca de Soto, Hidalgo. Built between 1904 and 1910 and inaugurated for the centenary of Mexican independence, the tower has become the city's best known symbol. Short clips of its chime began circulating in Mexican meme and WhatsApp groups as a shorthand for Pachuca itself, then spread to wider edits about waiting and time. Its local pride meaning keeps it in use beyond a generic clock effect.