Troika and Triptych

Troika noun - A Russian carriage pulled by three horses abreast.

Triptych and troika are semantically related in trio topic. In some cases you can use "Triptych" instead a noun "Troika".

Triptych noun - Art consisting of a painting or carving (especially an altarpiece) on three panels (usually hinged together).

Troika and triptych are semantically related in trio topic. You can use "Troika" instead a noun "Triptych", if it concerns topics such as three, three of something.