The terms Androgynous Peripheral Attach System, Androgynous Peripheral Assembly System and Androgynous Peripheral Docking System are used interchangeably to describe a Russian family of spacecraft docking mechanisms, and are also sometimes used as generic names for any docking system in that family.
The attach rate is a concept used broadly in business, especially in marketing, to represent the number of units of a secondary product/service sold as a direct or implied consequence of the sale of a primary product/service.