What term describes the outline of the face, head, and figure as seen from the side?

The term that describes the outline of the face, head, and figure as seen from the side is "Profile." In the context of hairstyling and haircutting, understanding a client's profile is essential for designing hairstyles that complement the structure of their face. A profile includes all the distinctive features and contours visible from a lateral view, allowing a stylist to formulate a haircut that enhances natural beauty by considering the balance and proportion of the client's features.

The other terms, while related to appearance, do not specifically convey the same meaning. "Shape" is a more general term that may refer to the overall structure but lacks the specificity of the side view. "Silhouette" typically refers to the overall outline or general shape, often in a broader context, and doesn't focus solely on the features of the face or figure from the side. "Convex" describes a type of curve or shape that is bulging outward, which doesn't pertain to the outline of a person's profile. Thus, the most appropriate and accurate term for the outline as viewed from the side is indeed "Profile."