About Rudra: Lord Shiva
Lord Shiva who is also known by the name Rudra.
As per Wikipedia
Rudra is a Rigvedic god of the storm, the wind, and the hunt. The name has been translated as "Roarer", Howler", "Wild One", and "Terrible".
Rudra is thought to be an early form of Shiva. By the time that the Ramayana was written, the name Rudra is taken as a synonym for Shiva and the two names are used interchangeably.
The Powerful God:
Shiva is 'Shakti' or power, Shiva is the destroyer, the most powerful god of the Hindu pantheon and one of the godheads in the Hindu Trinity. Known by many names - Mahadeva, Mahayogi, Pashupati, Nataraja, Bhairava, Vishwanath, Bhava, Bhole Nath - Lord Shiva is perhaps the most complex of Hindu deities. Hindus recognize this by putting his shrine in the temple separate from those of other deities.
Shiva as Phallic Symbol:
Shiva, in temples is usually found as a phallic symbol of the 'Linga', which represents the energies necessary for life on both the microcosmic and the macrocosmic levels, that is, the world in which we live and the world which constitutes the whole of the universe. In a temple, the 'Linga' is placed in the center underneath the spire, where it symbolizes the naval of the earth.
A Different Deity:
The actual image of Shiva is also distinct from other deities: his hair piled high on the top of his head, with a crescent tucked into it and the river Ganges tumbling from his hairs. Around his neck is a coiled serpent representing Kundalini or the spiritual energy within life. He holds a trident in his left hand in which is bound the 'damroo' (small leather drum). He sits on a tiger skin and on his right is a water pot. He wears the 'Rudraksha' beads and his whole body is smeared with ash.
The Destructive Force:
Shiva is believed to be at the core of the centrifugal force of the universe, because of his responsibility for death and destruction. Unlike the God head Brahma, the Creator, or Vishnu, the Preserver, Shiva is the dissolving force that is Destructer in life. But Shiva dissolves in order to create, since death is the medium for rebirth into a new life. So the opposites of life and death and creation and destruction both reside in his character.
The Most Fascinating of Gods:
He is also often portrayed as the supreme ascetic with a passive and composed disposition. Sometimes he is depicted riding a bull called Nandi decked in garlands. Although a very complicated deity, Shiva is one of the most fascinating of Hindu gods.
The God Who's Always High!:
Since Shiva is regarded as a mighty destructive power, to numb his negative potentials he is fed with opium and is also termed as 'Bhole Shankar', one who is oblivious of the world. Therefore, on Maha Shivratri, the night of Shiva worship, devotees, especially the menfolk, prepare an intoxicating drink called 'Thandai' (made from cannabis, almonds, and milk) sing songs in praise of the Lord and dance to the rhythm of the drums.
Ornament used by Shiva:
Rudraksha is adopted by Lord Shiva as ornament. He uses it as symbol of power, serenity and because of its unique beauty. He wears rudraksha in his jata (lock of hair), in his wrist as band, also as arm band and also as necklace.