Sword are a metal weapon that comes in different forms. Swords are often long and carried by a hand or two hands. Different cultures in the Milky Way and Pegasus galaxy lying on the medieval age using swords. Satedans used the sword of Satedan Planetary Forces to fight Wraith. (SGA: "Broken Ties")
Deascended Merlin placed a sword in "Avalon" as a test to be able to defeat the knight, and Cameron Mitchell pulled out the sword and defeated knight. (SG1: "Avalon, Part 1") And so Merlin also placed a sword in Camelot and if someone pulled the sword so betyde the Arthur are returning to Camelot. (SG1: "Camelot")