The New York State Identification and Intelligence System Phonetic Code, commonly known as NYSIIS, is a phonetic algorithm devised in 1970 as part of the New York State Identification and Intelligence System (now a part of the New York State Division of Criminal Justice Services).
It features an accuracy increase of 2.7% over the traditional Soundex algorithm.
[1] The algorithm, as described in Name Search Techniques,[2] is: