OSST

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AcronymDefinition
OSSTOberaargau-Solothurn-Seeland-Transport (Swiss railroad company)
OSSTOne Stop Service Tracking (Florida Agency for Workforce Innovation)
OSSTOrder of the Most Holy Trinity
OSSTOpus Security Solutions & Training (Australia)
OSSTOpen Source Software Torrents (computing; UK)
OSSTOrder of the Holy Trinity, Trinitarians (religious order)