Perhaps a specific institute (like a "TsNII..." acronym common in post-Soviet research centers)? Software/Tech: A specific library, file format, or tool?
It is possible that this is a typo, a highly specialized acronym, or a niche technical term. To help me provide the report you're looking for, could you double-check the spelling or provide a bit more context? For example, is this related to: Tsniazip
A specific medication or chemical compound? Perhaps a specific institute (like a "TsNII