Ok the symbol you descrive indicates it is a immobiliser capable key. This would be on a blue or brown key, (note not looked at my brown key).
I think you have a colour problem.
The normal blue key has an solid plastic handle you cannot open it up.
The normal brown key has a plastic handle that can be opened up, not brave enough to do this to mine.
Suggest you need to either practice walking, or take both your keys and auto to fiat dealer to get a 2nd blue key. You then put the brown key in a secure place, and dont lose either blue key cause you will be poorer.
If you damage the 'brown' key and lose or damage the blue key(s) you throw away the car or fit another ECU, (probably new steering wheel lock) and new set of keys, fancy selling a kidney, cause it is simpler getting a replacement sei?
If you lose a blue key the dealer can use the brown key to tell the car to ignore the lost blue key, the car knows the immoboliser codes of all of its own blue keys, they are all different.
This does not make a car thieves life any happier either.
Noel
P.S. I copy and paste
''''If the key has a transponder sign on it (Triangle with 2 little rings around the top) then it needs a master key. If it has a 2 on it, its a 2nd generation one and doesnt. If it has nothing then it dont need one either, according to Peter, chairman of FMCGB!
''''