A straight sword, as the name implies, refers to a type of sword with a straight blade. It is characterized by its lack of curvature along the blade's length. Straight swords have been utilized by various cultures throughout history, and their designs and specific names can vary depending on the time period and cultural context.

Here are a few examples of straight swords from different regions and historical periods:

1. European Longsword: The European longsword is a versatile and well-known straight sword that was prevalent during the late medieval and Renaissance periods in Europe. It typically features a straight, double-edged blade and a handle that can accommodate two hands. The longsword was used for a variety of techniques, including cutting, thrusting, and grappling.
2. Chinese Jian: The Chinese Jian is a straight, double-edged sword with a history spanning thousands of years. It is often considered one of the traditional Chinese weapons and embodies elegance and precision. The Jian has a straight, slender blade and a hilt designed for one or two hands, with distinctive guard and pommel designs.
3. Roman Gladius: The Roman Gladius was a straight, double-edged sword used by ancient Roman soldiers. It had a relatively short blade, typically around 18 to 24 inches (45 to 60 cm) in length, and a handle suitable for one hand. The Gladius was renowned for its effectiveness in close-quarters combat and was a symbol of Roman military might.

These are just a few examples of straight swords from different cultures and historical periods. Straight swords offer advantages in thrusting accuracy, versatility in combat techniques, and defensive capabilities. The specific design, size, and functionality of straight swords can vary based on the intended use, historical context, and cultural traditions associated with them.