The majority of breast implants used in cosmetic surgery have a round base. When one views the one of the breast implants from the side, the implant would have a certain height, which is called “projection.” Thus, when the breast implant is placed underneath or over the chest wall muscles, that height would project out. Some women who want to undergo a breast augmentation often want their breast to have more projection after the breast implant is placed.
Tebbets, J & S. Teitelbaum. High and Extra High Projection Breast Implants: Potential Consequences for Patients. Plastic Reconstructive Surgery. Dec 2010.126:2150