Persistent

Chemicals with a long inactivation or degradation time, such as some pesticides. Persistent substances can become dangerously concentrated in the tissues of organisms at the top end of a food chain.

A state in which data retains its original meaning as long as the system configuration remains unchanged, even across system reboots. However, any change to the system configuration (such as adding or deleting user IDs, and modifying the set of valid sensitivity labels) may render data non-persistent [POSIX.6].