A new feather on a bird in it's new-quill phase. If broken, the bird will likely bleed out and die.
Referenced in Highly Suspect's - "Bloodfeather", a person being your "bloodfeather" means that they're invaluable to you, and if something where to happen to them, it would be your pain and even your demise.
That girl's my bloodfeather, I couldn't think about life without her.
From the show Avatar: The Last Airbender
A variation of waterbending in which a master waterbender utilizes the power of the full moon to control the water in the blood of all living things. Hama, a survivor of the Fire Nation raids on the Southern Water Tribe, developed the technique while being held prisoner in a Fire Nation cell. The prisoners were given no water, so Hama had to improvise. She spent years developing the technique and practiced on the rats that scurried across her cage. Finally, she used her new skill to break out, controlling the guard to use his key to open her cage.
Hama invented Bloodbending and taught it to Katara. Hopefully, Katara will utilize that power in the 3rd Season
This is a type of independent, free thinking type of woman. She is not ruled by emotions. She is ruled by her own intellect and her own wants. She isn't emotional and can tell the truth straight up so blunt and honestly without considering your feelings. She's about her own and earning her trust and loyalty is something you must do. She's cold like winter until you give her reason to be be warm.
I tried asking Jessica out last night, and she straight up told me she would rather stay home and spend time with her dog than be seen in public with me. That is a cold blooded female.