Final answer:
The 'Triangle' face shape is not recognized as one of the seven basic facial shapes, which are oval, round, square, heart, diamond, and rectangle (or oblong). These shapes vary in form and dimensions, being hallmark references for aesthetic classification.
Step-by-step explanation:
When considering which of the following is NOT one of the seven basic facial shapes: 1) Oval, 2) Round, 3) Square, 4) Triangle, 5) Heart, 6) Diamond, 7) Rectangle, it's important to understand that the basic facial shapes are commonly accepted to be oval, round, square, heart, diamond, and oblong (another term for rectangle). However, 'triangle' is not typically classified as one of the standard face shapes in aesthetic categorizations and discussions about facial shapes. The standard shapes are recognized because they vary in shape; for example, an oval face shape is characterized by being longer than it is wide, a round face has a circular form, a square face features a strong jawline, and so forth. Therefore, the answer is the Triangle face shape, which is not typically listed as one of the standard seven.