It's the term Maori (New Zealand indigenous) people use for traditional weaving. The most common plant used for raranga is the harakeke (flax). Some results of raranga are
raranga means plane
a maori lady
Diggeress Te Kanawa (Ngati Maniapoto, Ngati Kinohaku) was born in Te Kuiti in 1920. She was a much respected and celebrated Tohunga Raranga (expert weaver) and daughter of another famous weaver, Rangimarie Hetet. Sadly, Diggeress died in July this year (2009).