Which synthetic fiber is known as artificial Silk?

Which synthetic fiber is known as artificial Silk?

کون سا مصنوعی ریشہ مصنوعی ریشم کے نام سے جانا جاتا ہے؟
Explanation

 The synthetic fiber known as artificial silk is called rayon.

Rayon is a semi-synthetic fiber derived from natural sources like wood pulp