The words Pili-Pili, Piri-Piri, and Peri-Peri all are used to refer to hot chile peppers, sauces and marinades made from them, and foods cooked with those sauces and marinades. This spicy hot marinade can be used on any meat you grill or broil: chicken, shrimp or prawns, beef, etc. In Africa, spicy meat brochettes are often-seen street food.

http://www.congocookbook.com/sauce_recipes/peri_peri_marinade.html
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Nando’s, the Portuguese-themed chicken restaurant originated in South Africa from Portuguese who left Mozambique after the independence in 1975. The chain uses piri-piri in many of its dishes, and helped popularise them worldwide. The company, however, prefers the common South African spelling peri peri on its menus and branded sauces.

http://en.wikipedia.org/wiki/Piri_piri