ISO 7010 Safe Condition sign E029: Emergency escape breathing device.
This uses an alternate aid symbol design, using the crescent symbol sometimes used in majority Muslim locations.

This a variation authorized by the ISO standard, "The first aid cross may be replaced with another element appropriate to cultural requirements."
This vector image includes elements that have been taken or adapted from this file:
Overall design: ISO
Original File: Clemenspool
This File: The Navigators