2002 jeep dash light shows key with circle around it means what

SOURCE: 2002 jeep dash light shows key with circle around

System operation
System arms after switching ignition OFF. Switch ignition ON. Immobilizer warning lamp illuminates for approximately 3 seconds. If immobilizer warning lamp flashes: Key code not recognised. Engine runs for approximately 2 seconds, then cuts out. System malfunction: Immobilizer warning lamp illuminates continuously.
Programming
When
System malfunction. Key added or replaced.
How
NOTE: Two programmed keys necessary. Complete each step within 15 seconds. Some models: Replacement key can only be programmed using diagnostic equipment.
Obtain all keys to be programmed. Using first programmed key, proceed as follows: Switch ignition ON and OFF within 15 seconds. Using second programmed key, proceed as follows: Switch ignition ON and OFF within 15 seconds. Within 10 seconds: Immobilizer LED flashes. Programming mode activated (acoustic signal will be heard). Proceed as follows: Within 50 seconds: Insert first key to be programmed into ignition switch. Switch ignition ON and OFF. Within 10 seconds: Single acoustic signal will be heard and immobilizer LED stops flashing and illuminates for 3 seconds to indicate correct programming. Repeat complete procedure to program remaining keys. Keys can also be programmed using diagnostic equipment.
NOTE: A maximum of 8 keys can be programmed.