There are a number of different types of mounts; box, book, furniture, stirrup, harness. Most are dress mounts though. The general term ‘mount’ is fine if you are unsure of where it would have been used, or use one of the above. Make sure you describe the shape, and how it would have been attached.
A complete Post Medieval cast copper alloy bar mount. It is rectangular, with 6 equally spaced circular knops each of the longer outer edges. It has a D-shaped cross-section. The front has decoration, in a floral pattern. On the back are two integral prongs, that are pointed and bent. The mount is complete, and in good condition. It is 34.1mm high, 15.3mm wide and 12mm thick. It weighs 2.5g. This is likely to date to the 16th or 17th century. Similar examples can be seen in Read, Metal Artefacts of Antiquity.