Category:ISO 15924:Cyrs

This category lists languages which use the Cyrillic (Old Church Slavonic variant) script (or cyrillique (variante slavonne) in French), coded Cyrs or 221 in ISO 15924 since 2004-05-01 [typology: alphabet, bicameral; main direction: ltr], supported by Unicode since version 1.1 (ref. : Ch7.4). See also Wikipedia:en:ISO 15924:Cyrs, Wikidata:Q442244.
You can render that script on your system with the following fonts (in order of coverage): 'Ponomar Unicode', 'Ponomar Unicode TT', Acathist, 'Triodion Unicode', 'Menaion Unicode', 'Menaion Unicode TT', Shafarik, 'Fedorovsk Unicode', 'Fedorovsk Unicode TT', 'Monomakh Unicode', 'Monomakh Unicode TT', Vilnius, 'Noto Serif', Sylfaen, sans-serif.