What curve feature can be used to easily add lettering to a model?

The Text feature is the appropriate choice for adding lettering to a model in Siemens NX. This feature allows users to create text directly on the 3D model's surface, offering a straightforward method to incorporate letters, numbers, and other characters. Using the Text tool, you can easily customize font styles, sizes, and positioning, making it ideal for labeling parts, engraving, or any situation requiring readable text directly on the model.

In contrast, while other options might serve different purposes in modeling, they do not specifically cater to the straightforward incorporation of standard lettering. The Law curve, for instance, is used to define the shape of a feature based on a set of parameters and does not inherently support text creation. Studio Spline offers flexibility in creating free-form curves but still lacks the direct functionality for text. The Emboss feature is primarily designed to create raised or recessed designs and may incorporate text, but it serves a different purpose focused more on three-dimensional manipulation than simply adding lettering. Hence, the Text feature remains the most efficient and effective choice for adding lettering to a model.