In Revelation 2:10, what crown does Jesus promise to those who are faithful even unto death?

Answer: The crown of life

To the church in Smyrna: "Be faithful even unto death, and I will give you the crown of life."

“Do not fear what you are about to suffer. Behold, the devil is about to throw some of you into prison to test you, and you will suffer tribulation for ten days. Be faithful even unto death, and I will give you the crown of life.”— Revelation 2:10 (BSB)