Inflorescence of Coriander is called

The inflorescence of coriander is called Umbel. It is the racemose inflorescence, also known as a compound umbel.
An umbel is an inflorescence that consists of several short flower stalks (called pedicels) that spread from a common point, somewhat like umbrella ribs. The word was coined in botanical usage in the 1590s, from Latin umbella "parasol, sunshade".