Dating orrefors glass
It is the number of yarns packed into a square inch of fabric.
A high-quality basic is 200TC made from single-ply Egyptian cotton.
5 Mathmos pink Poplight, £29.50, John Lewis (08456-049049; johnlewis.com).
Some experts believe the difference between 350 and 700-thread is barely noticeable, but according to Fiona Caulfield, the buyer for bedlinens at John Lewis, 'There is definitely a trend for people wanting a higher thread-count bedlinen.
We have pima [a high-quality cotton often used in shirt-making] 800TC, and it is incredibly popular.
5 Concrete statue, £315, Designers Guild (020-3301 5826; designersguild.com).
6 Sultan tapered drum table, £99, John Lewis (08456-049049; johnlewis.com) What does thread count (TC) actually refer to?