Which letter style is described as a form of uncial?

The letter style that is described as a form of uncial is actually the uncial style itself. Uncial letters were primarily used from the 3rd to the 9th centuries and are characterized by their rounded shapes and lack of connecting strokes. This style is often seen in the manuscripts of the Roman Empire and later in early Christian texts.

Celtic letters, while beautifully ornate and often associated with the Insular art of the British Isles, do derive some influences from uncial forms, but they feature distinct characteristics such as intricate knotwork and stylized designs that set them apart. The majuscule alphabet refers more generally to uppercase lettering without the specific rounded traits that uncial possesses. On the other hand, Carolingian script, which evolved later during the 8th and 9th centuries, shows a departure from the uncial style into a more formalized and legible script that was more suited to administrative needs.

Focusing on uncial itself, it directly represents the rounded, capital letter form which is the defining feature of this style, making it accurate to identify it as a form closely related to uncial.