It should belongs to Romans or Greeks. But when I search "roman patterns", "roman architecture patterns", symbols etc. It is useless. There should be a special name for them. Thanks for your attention. https://hizliresim.com/o6k6z9
This is a variation of the Greek key or meander motif. If you search for those terms, you will find ample examples, many of which come close to what you have here.