30,000 - 50,000 Scovilles. Yep, this is THAT pepper used to make that very famous hot sauce. It's one of the most well known peppers next to the jalapeno. The fruit is tapered and under 2 inches long. The color is usually creamy yellow to red, and turn yellow and orange before ripening to bright red.
The tabasco pepper is a variety of chili pepper species Capsicum frutescens, like the Naga Jolokia. It's a very pungent pepepr grown mostly in the Gulf Coast states.
The word, "tabasco", is the name of a state in Mexico.