n-gram:

        
    An N-gram is an ordered collection of N elements of the same kind, usually presented in a large collection of many other similar N-grams. The individual elements are commonly natural language words, though N-grams have been applied to many other data types, such as numbers, letters, genetic proteins in DNA, etc. Statistical N-gram analysis is commonly performed as part of natural language processing, bioinformatics, and information theory.