It's similar to J and that family of languages (K is another). Those are inspired by APL, which also has this super compact nature but in addition it largely us

It's similar to J and that family of languages (K is another). Those are inspired by APL, which also has this super compact nature but in addition it largely uses non-ascii symbols. Apparently it is something you can get used to and notionally has some advantages (extreme density means you can see 'more' of the program on a given page, for example, and you need fewer layers of abstraction).