Matrix 2 of 5 (also known as Code 2 of 5 Matrix.) is a variable length, discrete, two width symbology. Matrix 2 of 5 is a subset of two-out-of-five codes. Unlike Industrial 2 of 5 code, Matrix 2 of 5 can encode data not only with black bars but with white spaces. Matrix 2 of 5 was developed in 1970-х by Nieaf Co. in The Netherlands and commonly was uses for warehouse sorting, photo finishing, and airline ticket marking. Matrix 2 of 5 can encode only digits 0-9. Matrix 2 of 5 can include optional check digit. Most of barcode readers support this symbology.