"Feed the Birds"@en . . . "Actor Nathan Fillion considered the fist bump to be symbolic aggression, and invented the gesture as a more peaceful and nurturing alternative. It is meant to represent a mother bird feeding one of her chicks. Fillion has promoted the sign in some of his works, including Castle, usually with Esposito. In his Twitter feed, he sometimes abbreviates it FTB. The person to whom props are due should have their arm extended, fingers and thumb bunched together and pointing upward. The person who is giving props uses the same gesture, pointing downward, and \"pecks\" the other's upraised hand three times."@en . "Actor Nathan Fillion considered the fist bump to be symbolic aggression, and invented the gesture as a more peaceful and nurturing alternative. It is meant to represent a mother bird feeding one of her chicks. Fillion has promoted the sign in some of his works, including Castle, usually with Esposito. In his Twitter feed, he sometimes abbreviates it FTB. The person to whom props are due should have their arm extended, fingers and thumb bunched together and pointing upward. The person who is giving props uses the same gesture, pointing downward, and \"pecks\" the other's upraised hand three times."@en .