It can mean several things, for starters, you Playbook could be low on battery, or, it is the Coverage indicator, if you want to turn it off go to, Options then Screen/Keyboard then set LED Coverage indicator to OFF.
If it flashes red it means it has low battery, if it flashes green it means the battery is okay!
Dual peaked (two quick) white flashes between green flashes.
it turnes black
One green flash followed by multiple red flashes on a VingCard lock typically indicates an access denial. The green flash suggests that the lock has recognized the card, but the subsequent red flashes indicate that the card does not have the necessary permissions or is invalid for that specific lock or area. This could be due to various reasons, such as expired access, incorrect card type, or the card not being programmed for that lock.
it flashes only green
The Playbook was created in 2005.
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When. Can. We get. Kik on the blackberry PlayBook
What does it mean when the airbag light and battery light on 1999 Ford Escort flashes?
When the green light flashes on an Enercell universal charger, it typically indicates that the charger is in the process of charging a device. This flashing light may signal that the connection between the charger and the device is established and that charging is actively taking place. If the light remains solid green, it usually means the device is fully charged. Always refer to the user manual for specific indicators related to your model.
BlackBerry PlayBook was created on 2011-04-19.
Its mostly yellow, with white, green, blue and red flashes.