AC Unity: 6th tool/weapon?

when using the D-Pad to select tools and weapons (medicine, phantom blades etc.) theres is a sixth item on the right hand side after money pouch. a question mark is in its place. I've completed the game but can't work out what this is. what is the weapon/tool, how can it be unlocked??

 

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Last updated July 3, 2018 Views 3 Applies to: