Resurrection Ankh is a gameplay mechanic in Lara Croft: Relic Run.
Resurrection Ankhs are used to resurrect the player. The cost for the resurrection doubles every time you use it in a single run, the cost starts at 1 Ankh, then 2, 4, 8... and so on.
There are several ways one can obtain the Resurrection Ankhs. Most common way it to buy them via Gems, 1 Ankh costs 5 Gems (player must have completed Level 2 in order to unlock the resurrection Ankhs in store). 15 Resurrection Ankhs can be also occasionally found in the Supply Drop. 10 Resurrection Ankhs is a reward for 8 day consecutive logins.