What is lengthwise yarn called?
weaving, lengthwise yarns are called warp; crosswise yarns are called weft, or filling. Most woven fabrics are made with their outer edges finished in a manner that avoids raveling; these are called selvages. They run lengthwise, parallel to the warp yarns.
What is warp count?
The number of warp yarns per one inch or centimeter of fabric. This is also called sley, warp end count, ends per inch, or ends per centimeter.
How do I choose a warped yarn?
A good warp yarn needs to be strong, so that it will not break while under tension on the loom. It also needs to be smooth and without a lot of texture or stretch, especially when working on a rigid heddle loom or floor loom.