Keys
Jesus holds the keys and control of Death and Hades and he lives for ever and ever.
Keys denote authority and power.Hades is the Greek word for hell.
Background Reading:
Revelation 1:17-18
The Keys
17 When I saw him, I fell at his feet as though dead. Then he placed his right hand on me and said: "Do not be afraid. I am the First and the Last.18 I am the Living One; I was dead, and behold I am alive for ever and ever! And I hold the keys of death and Hades."