SUI30, or SUI 30, typically refers to a Stock Market index that tracks the performance of 30 leading companies in a particular market, often used to gauge the overall health of that market. However, without specific context, it's difficult to pinpoint exactly what SUI30 refers to, as it could also relate to a specific product, service, or concept in various fields. If you have a specific context in mind, please provide more details for a more accurate explanation.