The word "PYELONMTAN" appears to be a typographical error or a misspelling. It closely resembles "pylon," which refers to a large structure that supports a bridge, a highway overpass, or serves as a marker. If "PYELONMTAN" intended to reference "pylon," it usually indicates a tall structure that marks the entrance to a place or serves a functional purpose in construction and engineering.
The word "pylon" comes from the Greek word "pulōn," meaning "gate" or "entrance." It has been adapted into English to refer to the structures we describe today.