What is "vov-standard-bus"

The VöV-Standard-Bus is a standard for transit buses in Germany based on requirements by the VöV Association of German Transport Companies. The first concept was named (standard city bus) which resulted in multiple variants of VöV-Buses. The first generation was conceived in 1968 being in production to the mid 1980s when it was replaced by the second generation (sometimes abbreviated as SL-II) being in production up to 2000.