This is a key to reset panic buttons used in burglar/security alarms.

It's smaller than the FP2 key used to reset fire alarm devices.

The size of the key is scaled from measurements of a manufacturer key. (Example from retailer: Panic Button CQR Reset Key Access Control & Automatic Door Equipment (jwsltd.co.uk))

Printing

• You'll need to use supports to print the key. I've also attached a flat version of the key which is easier to print. (it doesn't feel as good when resetting versus the ‘raised’ key, though)
• 100% Infill
• Cura users: You could try a support angle of 40 degrees to make it easier to remove supports.

Credits

This is a remix of an FP2 key model made by Sagittario on Thingiverse (Attribution 4.0 International (CC BY 4.0))