People put rings on swords for various reasons, including practical, symbolic, and aesthetic considerations. Here are a few common reasons why rings are added to swords:

1. Improved Grip and Control: Rings on a sword's handle can provide additional points of grip, enhancing the wielder's control over the weapon. The rings act as tactile elements, allowing the hand to secure the sword firmly and prevent slippage during combat or handling. They offer stability and help the wielder maintain a solid grip, especially in situations where the hand might become sweaty or slippery.
2. Symbolic and Cultural Significance: Rings on a sword may hold symbolic meaning in different cultures and traditions. The number of rings, their specific design, or the materials used can have cultural or ritual significance. In some cases, the rings may represent power, honor, or social status. They might also symbolize unity, protection, or connection to certain spiritual or martial arts practices.
3. Decorative and Aesthetic Purposes: Rings can serve as decorative elements, adding visual interest and embellishing the sword's appearance. The rings may be crafted with intricate designs, patterns, or engravings, showcasing the skill and artistry of the swordsmith. They contribute to the overall aesthetic appeal of the sword and can make it visually distinctive or unique.
4. Historical or Traditional Influence: Some sword designs, including historical and cultural variations, incorporate rings as part of their traditional construction or as a nod to specific historical periods. These rings may be present to replicate a historical design feature or to pay homage to a particular style of sword-making.
5. Weight Distribution and Balance: In certain cases, rings on a sword's handle might be strategically placed to adjust the weight distribution and balance of the weapon. By adding or removing rings at specific locations, the swordsmith can fine-tune the balance to suit the intended use or the preferences of the wielder.

It's important to note that the presence of rings on a sword can vary greatly depending on the specific type of sword, cultural traditions, historical context, and individual swordsmith preferences. Each sword design and its accompanying rings may have specific purposes or meanings associated with them.