Istappar (Icicles) is a pattern card recipe for a cardigan. Istappar was designed by Bohus founder Emma Jacobsson some time between 1948-1955.
A photo of an original pattern card is on page 24 of Bohus Stickning på nytt The Revival. The pattern reference in the book describes the pattern as being made from angora yarn, however the pattern card describes thin fine wool. Chart notes also state this yarn is, unusually, used double in some pattern elements.