What are symbols on Boruto right hand? In episode of Boruto 66 there is a symbol that appears on his right hand. 

What is it? Is it a curse mark or sealing jutsu? What does it represent?
The symbol on Boruto's hand is known as a Kāma. 


  Kāma is a seal that takes the shape of a black diamond on the user's palm


Boruto received the Kāma after he defeated Momoshiki. With this, Boruto is able to absorb different techniques 


  After defeating Momoshiki, Boruto received a seal on his right hand in the shape of a diamond, with which Boruto can absorb other techniques, like fūinjutsu and nature transformation