Rectangular Micro QR Code (rMQR)
Rectangular Micro QR Code extends Micro QR Code with a new fixed set of rectangular symbol sizes. Use rMQR Codes in narrow spaces where conventional QR Codes can't be printed, and you want to store more information than with Micro QR codes.

Like with QR Code, rMQR Code employs Reed-Solomon error control coding to detect and correct errors if the rMQR barcode is dirty or damaged. rMQR Code uses variable error correction levels and can handle all types of data. rMQR Code is capable of storing up to 361 numeric characters and 219 alpha-numeric.
Note
The code has ISO certification through ISO/IEC DIS 23941.