Those funny-looking square mosaics are probably QR codes: two-dimensional codes that store information in a pattern of small squares. The wording is ambiguous, though—it can also describe an irregular shape in a calculus lesson. In everyday tech, QR code is the likeliest meaning.
What is a QR code?
A QR code is a two-dimensional code developed by DENSO WAVE in 1994. Unlike a conventional one-dimensional barcode, which encodes information along a line, a QR code stores information horizontally and vertically. That lets it hold data in a compact printed area.
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DENSO WAVE describes QR Code® as “a two-dimensional code developed by DENSO WAVE in 1994, and the most widely used in Japan.” The company developed it to meet manufacturing needs for a compact code that could hold more information and be read quickly.
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The three prominent corner patterns are position-detection patterns. DENSO WAVE says they help scanners identify and read a QR code quickly and stably from different angles. The smaller squares and other marks form the data pattern.
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- Continuous Usage All Day: The EY-H2 USB barcode scanner is designed to always be ready for the next scan, which significantly reduces downtime and repair costs; it shortens checkout lines, improves customer service, and boosts business productivity
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Can a damaged QR code still work?
QR codes include error correction, which can allow information to be recovered when parts of a code are stained or damaged. It is not a guarantee: whether a scanner can read a damaged code depends on how much of it is affected.
How much information can a QR code hold?
DENSO WAVE says the original 1994 QR Code could hold approximately 7,000 numerical characters. That figure describes the original code in the company’s 30th-anniversary account; it is not a capacity claim for every QR code, whose data capacity depends on the code used and what it encodes.
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- 【Digital and Printed 1D 2D QR Bar Code Symbologies】1D: Codabar, Code 11, Code93, MSI, Code 128, UCC/EAN-128, Code 39, EAN-8, EAN-13, UPC-A, ISBN, Industrial 25, Interleaved 25, Standard25, Matrix 2D: QR, DataMatrix, Aztec, Hanxin, Micro PDF417. (Note: Not compatible with Square.)
How did QR codes spread beyond manufacturing?
In DENSO WAVE’s account, QR codes began as a way to manage products and packages in manufacturing. Their use later expanded as mobile phones with QR-reading features appeared, making it possible to scan them without specialized equipment. Today, the same compact pattern can be printed on packaging or displayed on a screen for a compatible scanner or phone to read.
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Could “funny-looking squiggly squares” mean something else?
Yes. In a 2021 calculus course note, George Washington University instructor Jay Daigle uses similar “funny-looking and squiggly” wording while introducing irregular shapes and the problem of measuring their area. If the phrase came from a math class, it may refer to an irregular shape rather than a QR code. Context determines the meaning.
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- 【IP66 Waterproof Dustproof Mini Pocket 2D Scanner】Just bring this scanner with you. Anytime you want to collect data, just connect it with your device via Bluetooth or use the storage mode. 【Package Includes】Barcode Scanner x1, USB Cable x1, Dongle x1, User Manual x1.
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- 【Battery Level Indicator and 2200mAh Capacity】Larger battery enables longer continuous usage and twice the stand-by time of others. With the unique battery indicator light showing the remaining battery level, no more Low Battery Anxiety.
- 【Ergonomic Design】 The curved handle is extended and thickened, tailor-made for North America customers. Specially designed smooth and flat trigger for better grip. 【Package Includes】Barcode Scanner x1, USB Cable x1, Dongle x1, User Manual x1
- 【Anti-Shock Silicone】 The orange anti-shock silicone protective cover can avoid scratches and friction while falling from the height of 6.56 feet. IP54 technology protects the wireless barcode scanner from dust.
- 【2.4 GHz Wireless + USB 2.0 Wired Connection】 Plug and play with the USB receiver or the USB cable, no driver installation needed. Easy and quick to set up. Wireless transmission distance reaches up to 328 ft. in barrier free environment.
- 【Digital and Printed 1D 2D QR Bar Code Symbologies】1D: Codabar, Code 11, Code93, MSI, Code 128, UCC/EAN-128, Code 39, EAN-8, EAN-13, UPC-A, ISBN, Industrial 25, Interleaved 25, Standard25, Matrix 2D: QR, DataMatrix, PDF417, Aztec, Hanxin, Micro PDF417. (Note: Not compatible with Square.)
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