This is the 175th most frequent Russian word.
риа
"Риа" is a transliteration of the Russian word meaning "ria," a coastal inlet formed by the partial submergence of a river valley, or it can refer to "РИА" (an acronym for Russian Information Agency).
РИА is again used as a proper noun, representing the organization within the app context.
Я посмотрел программу в приложения РИА.
I watched a program in the RIA application.
РИА in this context is used as a part of a proper name, 'РИА Новости', which is a Russian news agency.
РИА Новости сообщает о важных событиях.
RIA Novosti reports on important events.
РИА here refers to the abbreviated form of the news agency name, used as a noun in conversation.