Y. J.-- In that pattern the tool you have is a Pike Pole (still being made) It was used, usually with a long ash handle, for raising timber frame and pole frame buildings (houses, barns, out buildings, etc.); it was also used as a push pole when felling pecker pole stands of timber (pulp wood, fence posts); and until the use of heavy equipment, for setting and plumbing utility poles. The twist is actually a screw point to give it purchase on whatever you are pushing. Your pattern would not be used much on river drives because of the screw point. The last thing you want is a grabby point when you are balancing on a log and trying to push or pull floating logs. I used to compete in log burling contests and it is tough enough just to stay on the log.