The term "reverse katana" is not commonly used or recognized within the realm of traditional Japanese swords. It could refer to different interpretations or concepts depending on the context. Here are a couple of possibilities:

1. Reverse Blade Katana: This refers to a katana where the cutting edge is intentionally turned inward or reversed. This concept is similar to the sakabato mentioned earlier, which is a fictional concept popularized by the character Kenshin Himura in the anime and manga series "Rurouni Kenshin." The reverse blade katana is designed for non-lethal combat, emphasizing the wielder's commitment to avoiding fatal strikes.
2. Non-traditional Design: In some cases, the term "reverse katana" might be used to describe a katana-like sword that deviates from traditional design elements. This could include changes in the shape, proportions, or hilt orientation that differentiate it from a standard katana.

It's important to note that traditional Japanese swords, such as the katana, follow a specific design and construction that has been refined over centuries. They have a curved, single-edged blade with the cutting edge on the outer side, which is optimized for effective cutting techniques. Any variation from this traditional design may fall into the realm of artistic interpretation, modern adaptations, or fictional concepts.

If you encounter the term "reverse katana" in a specific context, it would be helpful to provide more details for a more precise explanation.