Pi Day is celebrated on March 14th (3/14) around the world. Pi (the Greek letter "?") is the symbol used in mathematics to represent the ratio of the circumference of a circle to its diameter which is approximately 3.14159. This cowl is a circle made into a circle with stripes sized according to the digits of Pi. A nerd's delight!
Yarn - For single [double, triple] loop cowl. Split total yardage equally between at least three different colors, or as many as desired. Shown using five colors. Lace-weight yarn: 450 [1130, 1620] yards/ 411 [1033, 1481] meters total. Fingering-weight yarn: 415 [1000, 1500] yards/379 [914, 1372] meters total. Sport-weight yarn: 375 [950, 1375] yards/343 [869, 1257] meters total. DK-weight yarn: 345 [875, 1250] yards/315 [800, 1143] meters total. Worsted-weight yarn: 310 [785, 1125] yards/283 [718, 1029] meters total. Shown as double loop version in Knitted Wit Superwash Fingering (100% superwash merino; 200 yards/183 meters per 1.75 ounce/50 gram skein), colorways Yellow Brick Road, Cedar, Winter's Night, Naked, and Her Majesty.
Gauge - For lace (fingering, sport, DK, worsted) weight yarn, 26 (24, 22, 20, 18) stitches = 4"/10 cm in stockinette stitch. Gauge is not crucial, but will affect finished size.
Sizing / Finished Measurements:
One size fits most. For single (double, triple) loop: 22 (56, 80)" circumference, 8.5" wide. Measured after blocking.
Needles for working in the round (either 16"/40cm circular, double points, two circulars, or a long circular for magic loop)
For lace (fingering, sport, DK, worsted), use US #3/3.25mm (US #4/3.5mm, US #6/4mm, US #7/4.5mm, US #9/5.5mm) (or size to get gauge)