APL

A Programming Language is a functional language whose basic objects are arrays ( nouns ) , functions ( verbs ) and operators ( adverbs ) . Its infix syntax contributes to its widely noted concision . First implemented in the 1960s under Ken Iverson at IBM Research , its variants continue to be highly competitive for complex combinatoric problems , particularly in high level financial and actuarial applications .

APL supports both concatenative and applicative paradigm, and, because of its right-to-left execution order, all programs can be considered as concatenative.