My knowledge of Cyrillic is fleeting, and I’m mostly going off Wikipedia pages, so I hope someone who actually knows Russian can answer better.
The main Cyrillic Wikipedia page says that is the acute accent (check the Diacritics section). It says it marks stress on a vowel. I don’t know what that means though, so that’s as far as I can help.
My knowledge of Cyrillic is fleeting, and I’m mostly going off Wikipedia pages, so I hope someone who actually knows Russian can answer better.
The main Cyrillic Wikipedia page says that is the acute accent (check the Diacritics section). It says it marks stress on a vowel. I don’t know what that means though, so that’s as far as I can help.