At my yoga studio, we call this pose a prayer twist, but you may also hear it referred to as revolved chair or parivrtta utkatasana. There is also a variation with your arms extended out, but here we will focus on the basic form with your palms pressed together.
I'll walk you through how to get into this twist from chair pose, so if you need a refresher on utkatasana, you can go read How to Hold Chair Pose in Yoga and then come back here.
Note: This is a big twist. Please ensure that your spine is warmed up for it by first doing a few stretches forward and back and side to side. You can do a few rounds of folding forward and coming into a halfway lift, and flowing through a vinyasa with extended side angle and reverse warrior will also help prep your body.