A spear was a weapon consisting of a long shaft with one end sharpened, either by sharpening the shaft or by attaching another element to the shaft. Some types of spears were used primarily as a hand held weapons while others were designed to be thrown at an opponent from a distance.
When the Kazon-Nistrim captured the USS Voyager and marooned the crew on Hanon IV without any of their technology (or, for that matter, any food or supplies), some of the crew members, including Chakotay and Harry Kim, created and used spears. While rescuing Kes from a group of Hanon IV natives, some members of Chakotay's search team threw their spears at the natives. The group later held a Hanonian land eel in the cave into which they had fled at bay by throwing spears, and Tuvok shooting arrows, at the creature, but only briefly; upon exiting from the cave, Tuvok, Chakotay and Kim collapsed the entrance by prying loose rocks from the roof of the cave, using their spears for reach and leverage. (VOY: "Basics, Part II")