There is no such feat as I know of.
There is:
Cleric gets their dieties favored/signature weapon if they take the war domain.
The Kensai ability.
Signature Spell is a feat from the FRCS, that stems of of Spell Thematics I believe. Cool feat, that spell thematics.
The Spycraft campaign setting has a Signature Gear Feat (maybe)
Also, as a general note if you're asking for a specific feat or rule you should throw this over in D&D rules. Much more people over there, they can help better.