Indestructible

Indestructible is a static ability that lets a permanent become immune to lethal damage and destruction spells.

Comprehensive Rules
702.12. Indestructible

702.12a Indestructible is a static ability.

702.12b A permanent with indestructible can’t be destroyed. Such permanents aren’t destroyed by lethal damage, and they ignore the state-based action that checks for lethal damage (see rule 704.5g).

702.12c Multiple instances of indestructible on the same permanent are redundant.