Yarn guidance sources and conventions

Yarn labels, fibre content, and care

• US Federal Trade Commission textile and wool labelling guide for fibre names, percentages, and identity statements.
• FTC Wool Products Labeling Rules for wool-product label requirements.
• FTC Care Labeling Rule guide for care-instruction context.
• Craft Yarn Council yarn-label information for common label fields and care symbols.

Weight, gauge, and pattern terminology

• Craft Yarn Council Standard Yarn Weight System for numbered weight categories and indicative tool and gauge ranges.
• Craft Yarn Council wraps-per-inch guide for a comparative strand-thickness check.
• Knitting abbreviations and crochet abbreviations for common US terms.
• Knitting chart symbols and crochet chart symbols for widely used chart keys.

Measurements and maker safety

• US National Institute of Standards and Technology length units for metre, centimetre, and millimetre definitions.
• NHS repetitive strain injury guidance for symptoms and when to seek health advice.

Working conventions

• A yarn-weight category is a starting point; a washed gauge swatch decides whether a yarn suits a particular fabric.
• Quantity comparisons use total length, with all values converted to the same unit before adding or dividing.
• Pattern abbreviations and chart symbols follow the pattern's own key first; the common references above help when no key is supplied.
• Care follows the yarn label and the needs of the finished item, with a swatch used to check washing and drying behaviour.
• Pattern attribution and licence links remain beside the affected pattern when the licence requires them.

Corrections

To report an unclear term, measurement, or source, include the page address and the affected passage on the contact page.