A higher thread count simply means there are more threads per square inch, but what is agoodthread count depends on the style of the sheet. For example, good quality percale sheets usually have a thread count of 180 to 300, whereas good quality sateen usually have a thread count of 300 to 600. This is because sateen requires more threads, due to the weave style, than percale does. 

Bed Linen: Bed linen is an umbrella term that encompasses the entire collection of fabric-based bedding components. This includes the bed sheet, but also extends to pillowcases, duvet covers, and sometimes blankets or comforters. Bed linen represents the complete textile outfit of your bed.