Fair Isle (/fɛəraɪ̯l/) is a traditional knitting
technique used to create patterns with multiple colours. It is named
after Fair Isle, one of the Shetland Islands. Fair Isle knitting gained
considerable popularity when the Prince of Wales (later Edward VIII)
wore Fair Isle jumpers in public in 1921. Traditional Fair Isle patterns
have a limited palette of five or so colours, use only two colours per
row, are worked in the round, and limit the length of a run of any
particular colour.