Icon - Wood - Saint Nicholas

It is an Orthodox icon of Saint Nicholas, specifically Saint Nicholas the Wonderworker or Nicholas of Myra (Sviatí Nikolái Chudotvórets).

Elements that help identify it
Inscription in Cyrillic: on both sides of the head the designation Saint Nicholas is visible.
Episcopal vestments: he appears as a bishop, with the omophorion over the shoulders.
Gospel in the left hand: decorated with a sacred image on the cover.
Right hand in a blessing gesture.
Golden halo, symbol of holiness.
The iconography corresponds to the traditional Russian/Byzantine model of Saint Nicholas of Myra, the Miracle Worker.

The saint depicted is the famous bishop of Myra in Lycia (present-day Turkey), one of the most venerated saints of the Orthodox Church and also the historical origin of the figure of Santa Claus / Father Christmas.