A matrix code, also known as a 2D barcode, is a two-dimensional way of representing information. It is similar to a linear (1-dimensional) barcode, but has more data representation capability.
Some examples:
| Symbology | Notes |
|---|---|
| 3-DI | Developed by Lynn Ltd. |
| ArrayTag | From ArrayTech Systems. |
| Aztec Code | Designed by Andrew Longacre at Welch Allyn. Public domain. |
| Small Aztec Code | Space conscious version of Aztec code. |
| Bullseye | This was the barcode tested in a Kroger store in Cincinnati. It used concentric bars. |
| Codablock | Stacked 1D barcodes. |
| Code 1 | Public domain. |
| Code 16K | Based on 1D Code 128. |
| Code 49 | Stacked 1D barcodes from Intermec Corp. |
| CP Code | From CP Tron, Inc. |
| Data Glyphs | From Xerox PARC. |
| Data matrix | From RVSI Acuity CiMatrix. |
| Datastrip Code | From Datastrip, Inc. |
| Dot Code A | Designed for the unique identification of items. |
| HueCode | From Robot Design Associates. Uses greyscale or colour. |
| INTACTA.CODE | From INTACTA Technologies, Inc. |
| MaxiCode | Used by United Parcel Service. |
| MiniCode | From Omniplanar, Inc. |
| PDF417 | The most common 2D barcode. Public domain. |
| Micro PDF417 | Facilitates codes too small to be used in PDF417. |
| QR Code | From Nippondenso ID Systems. Can encode Japanese Kanji and Kana characters. Public domain. |
| Semacode | Open standard for picture cell phones |
| SmartCode | From InfoImaging Technologies. |
| Snowflake Code | From Marconi Data Systems, Inc. |
| SpotCode | Circular barcodes for camera phones from High Energy Magic Ltd. |
| SuperCode | Public domain. |
| UltraCode | Black-and-white & colour versions. Public domain. Invented by Jeffrey Kaufman and Clive Hohberger. |
Descriptions of most of these codes can be found at BarCode 1
 | This technology-related article is a stub. You can help Wikipedia by expanding it. |