Shiva (Sanskrit: Auspicious One), or Siva, is one of the main Deities of Hinduism, worshipped as the paramount lord by the Saivite sects of India. Shiva is one of the most complex gods of India, embodying seemingly contradictory qualities. He is the destroyer and the restorer, the great ascetic and the symbol of sensuality, the benevolent herdsman of souls and the wrathful avenger.

Shiva was originally known as Rudra, a minor deity addressed only three times in the Rig Veda.  He gained importance after absorbing some of the characteristics of an earlier fertility god and became Shiva, part of the trinity, or trimurti, with Vishnu and Brahma.

The Bell, known in Sanskrit as the Ghanta/Ghanti is used in all poojas for invoking the Gods. The ringing of the bell produces what is regarded as an auspicious sound. It produces the sound Om, the universal name of the Lord. There should be auspiciousness within and without, to gain the vision of the Lord who is all-auspiciousness.

Another significance of ringing the bell is that they help drown any inauspicious or irrelevant noises and comments that might disturb or distract the worshippers in their devotional ardor (dedication), concentration and inner peace.

Agamaarthamtu devaanaam Gamanaarthamtu rakshasaam
Kurve ghantaaravam tatra Devataahvaahna lakshanam

Means:
I ring this bell indicating the invocation of divinity, So that virtuous and noble forces enter (my home and heart); And the demonic and evil forces from within and without, depart.

Shiva bell has very sweet sound and these sounds help to drown any inauspicious or negative vibes present in atmosphere .