Shiva represents the entire cosmos.

According to some schools of thought, Shiva represents the entire cosmos. 

Shiva or Maheshwara is the Divine Lord and in him are concentrated the three energies of understanding (Gyana), the will (Ichha) and action (Kriya) - thus forming the fountainhead of all knowledge. The nature of Shiva as representing the entire cosmos has led to his having 1008 names in the various Hindu scriptures extending the Vedic concept of multiple forms of a single divine power. The Vedas do not mention Shiva as the name of the god in question - instead he is named Rudra - the lord of songs, sacrifices, nourishment, the healer of diseases and the provider of property.

The Vishnu Purana (religious Hindu text) describes the origin of Lord Shiva. It says that Brahma was initially unsuccessful in his attempts of creation. He meditated for a child, after which a child sprang forth from his forehead and divided itself into a male and female part. The male part started crying inconsolably. On being asked the reason for crying the child said it did not have a name, at which, Brahma named him Rudra - which also means the one who howls. However Brahma had to give him seven more names - for the seven more times that the child cried, giving Shiva his eight forms: Rudra, Sharva, Bhava, Ugra, Bhima, Pashupati, Ishana, and Mahadeva. The Shiva Purana then goes on to describe how each of these names is associated with an element - the earth, water, fire, wind, sky, a yogi called Kshetragya, the sun, and the moon respectively. The female part of the child born from Brahma's forehead is believed to be Parvati - Shiva's consort.

Om Namah Shivay