What is a model called that has features proportional to the original object?

A model that has features proportional to the original object is referred to as a scale model. Scale models are utilized in various fields, from architecture to engineering, where it's essential to represent the size and features of actual objects with accuracy in a smaller or larger form. They maintain the same proportions as the original, allowing for a clearer understanding of the design while being more manageable to work with.

In contrast, a 3D model typically refers to a digital or physical representation that may not necessarily maintain the proportions of the original object. A functional model is designed to illustrate how something works rather than focusing solely on representing its size or shape accurately. A physical model may refer to any tangible representation, including ones that do not adhere to proportionality.