ballottement: a palpatory technique for feeling a floating object in the body (especially for determining the position of a fetus by feeling the rebound of the fetus after a quick digital tap on the wall of the uterus)
palpation: a method of examination in which the examiner feels the size or shape or firmness or location of something (of body parts when the examiner is a health professional)
butt hinge: a hinge mortised flush into the edge of the door and jamb