PIN SITE is a term used to describe a secure location where a personal identification number (PIN) can be entered. An ALLEY is a narrow passageway between two buildings, often lined with shops or residences. MAT is a flat piece of material, such as rubber, used to cover a floor or other surface. A LAPEL is the part of a garment, usually a jacket or coat, that is folded back on either side of the front opening. Together, these three words form the term PIN SITE, which is a secure location where a PIN can be entered.