complete. Although the intent is to develop it into a full-featured language, the software is currently at a very early "proof of concept" stage, requiring the addition of many operations (such as basic number and file operations) and optimizations before it can be considered useful for any real-world purpose. It has been made available in order to demonstrate the underlying concepts and welcome others to get involved in early development."

It would be helpful to see any kind of motivation for the project though. Anything at all.

So, you're not surprised that this Om page has an extensive section called "Examples", right? https://www.om-language.com/#language__examples__

It concludes by implementing a fold:

   define
   {
       [Fold]<- {
           rearrange
           {
               rearrange
               {
                   dequote
                   choose
                   quote Result
                   pair pair pair {[Fold]<-} Function Result Remainder
                   Remainder
               }
               {Result Remainder}
               dequote Function Base <-[terms] Source
           }
           {Function Base Source}
        }
   }
   {
       [Fold]<- {[literal]<-} {} {1 2 3}
   }