Troika - Wikipedia
https://en.wikipedia.org/wiki/Troika
Troika or troyka (from Russian тройка, meaning 'a set of three') may refer to: Troika (driving), a traditional Russian harness driving combination, a cultural icon of Russia. Troika (dance), a Russian folk dance.
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Convenient application - assistant for instant replenishment of the cards ′′ Troika ". Forget queues, lack of balance or expired ticket. Replenish whenever and wherever you want: at home...
How to use a Troika card on Moscow's Metro, and other ways to buy...
https://www.rbth.com/travel/326613-how-to-use-troika-card
Your Troika's balance can be checked on the app or on the small yellow terminals inside the metro How to get a Troika: Get the card in any metro kiosk or automated ticket office. The card is free, but...