tvíþráðu
Tvíþráðu is an Icelandic term that translates to "two-threaded" in English. It is primarily used in the context of knitting and refers to a specific technique or style of working with yarn. When knitting tvíþráðu, two strands of yarn are held and worked together as if they were a single strand. This can be done for a variety of reasons, including to achieve a thicker fabric, to create a marled or heathered effect by combining different colored yarns, or to create a stronger and more durable finished product.
The practice of knitting with two strands is not unique to Iceland, and similar techniques are employed