Craig is correct. The term "vegetable oil" can mean just about anything. However, if you go to your local supermarket, and especially one that carries many brands of oils, including well known names like Crisco and Wesson, but house brands as well, you will find that invariably the vegetable oil is soybean (soy) oil. The front label for that oil might say that it is 100% pure or all natural or other words to that effect but it is still just ordinary soybean oil. Once in a while, a lesser brand might say that it is a vegetable oil but contain no soybean oil. An example of such a brand is the 1-2-3 brand of vegetable oil. It comprises a blend of canola and sunflower oil. When blends of oils are intended, the front label of the blend will always say that it is a blend, and elsewhere on the container the oils that make up the blend will be identified, by order of predominance. Common blends include soybean and canola oils (or vice versa), or canola, sunflower and soybean oils.
If it matters to you, you might send a followup email to Shawn and ask him how his vegetable oil differs from his soy oil.