A very nice pike? Or lance. Can we see the other end of the pole? How long is the shaft? The four-sided point pattern usually indicates the late 18th/early 19th century. This dating also supported by the type of securing screw through the shaft. If the shaft is short, perhaps a boarding pike (military pikes long gone by this time), if a longer pole would indicate a lance, which were still used up to the end of the 19th c.
Mark