Peppers come in a variety of heat levels, and it can be difficult to accurately categorize them. To help narrow down searches for users, one suggestion is to assign varieties to a reasonable number of heat levels. This could include Sweet (<100 SHU), Mild (100 - 2500 SHU), Medium Hot (2500-50,000 SHU), Hot (50,000 - 500,000 SHU) and Ultra Hot (500,000+ SHU).
However, while researching this idea online, I found that there are several different scales being used. Two of these were close to the su