A 'real' signal mirror is a mirror with a built-in way to precisely aim it's reflection (from the sun), and is intended to alert others of your location.
Coghlan's Signal Mirror – Endure Survival Kits
ESEE RAT Signal Mirror
MIL-M-18371E Emergency Signal Mirror, Mark 3, Military Issue
An emergency signal device is an essential part of any survival emergency kit. One of the five major elements of outdoor survival is the ability to signal for help so that you are more visible to search and rescue. There is a consensus among survival experts all over the world: Anyone who is engaged in remote outdoor activities should carry a rescue flash signal mirror and a loud survival whistle.
Emergency [Signal Mirror] for Hiking, Backpacking, Boating, Skiing
ESEE RAT Signal Mirror
MIL-M-18371E Emergency Signal Mirror, Mark 3, Military Issue
Emergency Emergency Emergency Mirror
An emergency signal device is an essential part of any survival emergency kit. One of the five major elements of outdoor survival is the ability to signal for help so that you are more visible to search and rescue. There is a consensus among survival experts all over the world: Anyone who is engaged in remote outdoor activities should carry a rescue flash signal mirror and a loud survival whistle.
Emergency [Signal Mirror] for Hiking, Backpacking, Boating, Skiing
Best Glide Ase Compact, Military Grade, Stainless Steel, Emergency Signal Mirror (2 Pack)
SIGNALING B.O.S.S.- BUG OUT SURVIVAL SUPPLEMENT - The
Pocket Preps: Emergency Signaling Devices
Survival Mirrors Signal Glass Mirror with Whistle/Compass/Lanyard
Compact Emergency Survival Mirror – Best Glide ASE