Final answer:
The purpose of an arrow to reciprocal clasp located above or at the Height of Contour (HOC) is to serve as a functional fastening device while also providing decorative value, often signifying status or identity. Artifacts like the Crossbow Brooch illustrate the combination of these functional and aesthetic purposes.
Step-by-step explanation:
The question "Arrow to reciprocal clasp (above/at HOC) - what is purpose?" seems to be inquiring about the functional and decorative aspects of a clasp, likely related to historic or archaeological artifacts such as brooches. In historic contexts, especially within antiquities like the Crossbow Brooch from around 430 CE, clasps served as both functional and decorative elements. They were used to fasten garments and also acted as symbols of status or identity.
The reciprocal clasp is a type of fastening device that typically features two interlocking parts, which securely hold the garment in place. These clasps were often located at or above the Height of Contour (HOC), which is the greatest elevation of an object in relation to the plane of observation, ensuring that the decorations, such as floral motifs or acanthus leaves, are prominently displayed while the clasp is in use.