APL stands for “A Programming Language” but don’t let that simplicity in the name fool you. APL is one of the most peculiar languages in the market, mainly because it uses a wide range of special graphic symbols for its functions and operators. Today, it’s mostly used for commercial and scientific purposes. 

APL (named after the book A Programming Language) is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array.