Ringleva
Ringleva is a term that appears to be a neologism or a very niche term with limited readily available public information. Its meaning and usage are not widely established in common dictionaries or encyclopedic resources.
There are several possibilities for what "ringleva" might refer to. It could be a specific brand name
If "ringleva" has been encountered in a specific context, such as a book, a website, a product