What is the stroke used to create part of the upper portion in Celtic letters E, F, and G called?

The stroke used to create part of the upper portion in Celtic letters E, F, and G is referred to as a fillet. In calligraphy, a fillet is a small, decorative stroke that often serves to enhance the overall design and structure of letters. This element is particularly characteristic of Celtic calligraphy, where it contributes to the intricate and ornate nature of the letterforms. The fillet often connects different components of the letters and can be an important stylistic feature that brings coherence and fluidity to the design.

Understanding the role of a fillet in Celtic lettering allows calligraphers to appreciate and replicate the unique features that define this style. It’s essential in the context of the letters E, F, and G, as these forms often emphasize such decorative touches. This focus on detail is crucial in mastering the art of calligraphy.