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|Beef cut:||Bottom Sirloin|
|(also known as: "triangle steak")|
The scientific name of this muscle is tensor fasciae latae, inserted in the fascia lata, the connective tissue covering the quadriceps femoris, also called quadriceps extensor, a group of four muscles which in turn insert in the patella, or knee cap of the animal.
United States 
In the United States, this cut was typically used for ground beef or sliced into steaks until the late 1950s, when Otto Schaefer marketed it in Oakland, California. Shortly thereafter, it became a local specialty in Santa Maria, California, rubbed with salt, pepper, garlic salt, and other seasonings, grilled slow and low over red oak wood, and roasted whole on a rotisserie, smoked in a pit, baked in an oven, grilled, or braised in a Dutch oven after searing on a grill. After cooking, the meat is normally sliced across the grain before serving.
Often labeled "Santa Maria steak", the roast is most popular in the Central Coast of California and Central Valley regions of California, and has begun to enjoy increasing favor elsewhere for its full flavor, lower fat content, and comparatively lower cost.
Tri-tip has also become a popular cut of meat for producing chili con carne on the competitive chili cooking circuit, supplanting ground beef because the low fat content produces little grease, for which judges take off points.
Tri-tip is a close cousin of the culotte steak, which is cut from the top sirloin.
In much of Europe the tri-tip is usually sliced into steaks. In France the tri-tip is called aiguillette baronne and is left whole as a roast. In northern Germany, it is called Bürgermeisterstück or Pastorenstück, in Austria Hüferschwanz and in southern Germany it is called the same name as the traditional and popular Bavarian and Austrian dish "Tafelspitz", which serves it boiled with horseradish. In Spain, it is often grilled whole and called the "rabillo de cadera". In Central America, this cut is also usually grilled in its entirety, and is known as punta de Solomo; in South America, it is grilled as part of the Argentine asado and is known as colita de cuadril, in Chile it is a popular roast called "punta de picana", in Mexico it is known as picaña, in Colombian cuisine it is a popular cut for grilled steaks and is known as punta de anca, and in Venezuela it is known as "pollo de res". In Brazil it is a common cut for the traditional Brazilian churrasco and is known as maminha, not picanha, which is from the top sirloin, not the bottom.