This is the 130th most frequent Serbian word.
ртс
"РТС" stands for "Radio Television of Serbia," Serbia's public broadcasting service.
In this case, 'РТС' again refers to 'Radio Television of Serbia', specifically one of its channels that aired the documentary. The usage involves the consumption of media content broadcasted by RTS.
Гледао сам интересантан документарни филм на РТС-у јуче увече.
I watched an interesting documentary film on RTS last night.
This usage highlights a particular aspect of RTS's multifaceted services, mentioning its provision of news as a service, which forms a significant part of its operation.
Мој отац воли да слуша вести са ранчевог сервиса РТС-а.
My father enjoys listening to news from RTS's broadcast service.
Here, 'РТС' references the Serbian national public broadcaster, 'Radio Television of Serbia', commonly abbreviated as RTS in Serbian. Thus, it's used as a proper noun to denote the organization in question.