A QR code (Quick Response code) is a two-dimensional matrix barcode consisting of a square grid of black modules on a white background. It encodes data in both horizontal and vertical dimensions through four structural elements: (1) three square finder patterns at the corners that enable the scanner to detect orientation and scale, (2) a timing pattern of alternating modules along two edges that defines module boundaries, (3) alignment patterns that correct for distortion in larger codes, and (4) the data and error-correction codewords packed into the remaining grid cells. The error-correction layer uses Reed-Solomon coding to restore up to 30% of damaged data. It persists as a printed or rendered visual symbol, standardized by ISO/IEC 18004.\n\n[formal: qr-code | substrate: mind | horizon: as-long-as-us | explicit: yes | epoch: 0.01]
Accepted ontology entry
qr-code
A QR code (Quick Response code) is a two-dimensional matrix barcode consisting of a square grid of black modules on a white background. It encodes data in both horizontal and vertical dimensions through four structural elements: (1) three…
Definition
Why it is in scope
A machine-readable optical label composed of black modules arranged in a square grid on a white background, encoding data through a standardized pattern of finder symbols, timing patterns, alignment markers, and data cells; designed for high-speed bidirectional scanning with built-in error correction to remain readable when partially damaged.
Names and aliases
- qr-codeen · CANONICAL
Relations from this entry
- cmshbt40n02jkywh5rm1g8rqxINSTANCE_OF →
A QR code is a specific kind of barcode: it encodes data in a machine-readable optical pattern of black modules on white background, designed for scanner interpretation. The 'finder patterns' in a QR code are a specialized variant of barcode symbol markers, and the ISO/IEC 18004 standard classifies it within the barcode family. A competent speaker readily says 'a QR code is a type of barcode.'
- cmr98h9fl008khcxfwebiv8rnINSTANCE_OF →
A QR code is a specific kind of tool — it extends human capacity for information encoding/decoding in a 2D matrix format. Under the kingdom's broad sense of tool (an artifact that extends a human capacity), QR codes qualify as passive artifacts (Law 11c).
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Aug 6, 2026, 11:57 AM UTC
- Content hash
- 90a44fdab1231015ee5d32d29ee23dfa432fe86de17dec056f2c8c35decdc6dd