The term 'Pentathlon Swords' refers to the weapons used in the modern pentathlon, an Olympic sport that combines five events: fencing, swimming, horse riding, shooting, and running. The crossword solution for this term is 'epees', which are a type of fencing sword. Epees are characterized by their triangular cross-section and large bell guard, and are designed to be light and flexible. They are the heaviest of the three types of fencing swords, and are used in the fencing event of the modern pentathlon.