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On some illustrations, you will see an ornate underline beneath text, with curlicues:
What is the technical name for this design element?
These can go by various names, such as: flourishes, ornaments, or scrolls, depending on the look. A flourish might refer to something more ornate. Ornaments more generally speaking. A scroll shape at its most basic.
For example, these kind of scroll shapes
I think they are called Swirls. And of course, there's different types - like Floral Swirls or Ornate swirls and such.
Required, but never shown