Final Answer:
The port of device used in the story in "The Green Knight" that is a three-syllable word followed by four arrived lines is called a "router."
Step-by-step explanation:
In the context of the question, the port of device referred to is commonly known as a router. A router is a networking device that directs data traffic between computer networks.
The description of "012 or three syllable word followed by four arrived lines" aligns with the word "router."
Breaking down the components of the answer, "012" implies a numerical sequence, which is a characteristic of network-related devices. The requirement for a "three-syllable word" aligns perfectly with the term "router," which has three distinct syllables: "rou-ter."
Finally, the phrase "four arrived lines" could be interpreted as the four ports commonly found on a router for connecting devices. Therefore, the term "router" accurately fits the criteria specified in the question, making it the correct and final answer.
In summary, the answer draws on both technical knowledge of networking devices and a careful analysis of the linguistic clues provided in the question to arrive at the correct solution.