Title: Conceptions of God
Content:  Lord Shiva is more often considered as first Hindu God. Mahadeva literally means "Highest of all god". Shiva is also known as Maheshvar, the great Lord, Mahadeva, the great God, Shambhu, Hara, Pinakadhrik, bearer of the axe and Mrityunjaya, conqueror of death. He is the spouse of Shakti, the goddess. He also is represented by Mahakala and Bhairava, the terrible, as well as many other forms including Rudra. Shiva is often pictured holding the damaru, an hour-glass shape drum, shown below with his trishula. His usual mantra is om namah shivaya. This must not be confused with the numerous devas.  may be roughly translated into English as deity, 
Title: Hindu iconography
Content:  The Shiva Lingam represents the divine being Shiva, and is used as a symbol of the power of fertility and strength. Shivalinga (Sivalinga) is the most important and a popular symbolic representation of Lord Shiva (Siva) in Hinduism. It represents God Himself in His all the three aspects – Creator, Sustainer or Protector and Destroyer (Dissolutor).
Title: Head of Shiva
Content:  Shiva is considered as one of the major deities in Hinduism. Together with Vishnu and Brahma, Shiva is called the "trimurti" or triad of gods. Shiva is described as both destruction deity and creator deity. Shiva is the most revered god of Indian people, evolved from the Vedic period. The sect of Hinduism, which considers Shiva as the supreme deity is called Shaivism. Goddess Parvati is the consort of Shiva. Shiva is considered as the supreme god and creator of the universe in Shaivism. It is mentioned in Hindu mythology that, origin, destruction and maintenance of the universe is associated with Shiva’s dance. 
Title: Shiva
Content:  Parvati and his two children, Ganesha and Kartikeya. In his fierce aspects, he is often depicted slaying demons. Shiva is also known as Adiyogi Shiva, regarded as the patron god of yoga, meditation and arts. The iconographical attributes of Shiva are the serpent around his neck, the adorning crescent moon, the holy river Ganga flowing from his matted hair, the third eye on his forehead, the trishula or trident, as his weapon, and the damaru drum. He is usually worshipped in the aniconic form of lingam. Shiva is a pan-Hindu deity, revered widely by Hindus, in India, Nepal, Sri Lanka and Indonesia (especially in Java and Bali).
Title: Shiva
Content:  According to Gavin Flood, "Shiva is a god of ambiguity and paradox," whose attributes include opposing themes. The ambivalent nature of this deity is apparent in some of his names and the stories told about him.
Title: Shiva
Content:  Shiva (शिव, ), also known as Mahadeva (महादेव: [mɐɦaːd̪eːʋɐ]), is one of the principal deities of Hinduism. He is the Supreme Being in Shaivism, one of the major traditions within Hinduism. Shiva has pre-Vedic tribal roots, and the figure of Shiva as we know him today is an amalgamation of various older non-Vedic and Vedic deities, including the Rigvedic storm god Rudra who may also have non-Vedic origins, into a single major deity. Shiva is known as "The Destroyer" within the Trimurti, the triple deity of supreme divinity that includes Brahma and Vishnu. In the Shaivite tradition, Shiva is the Supreme Lord who creates, protects and transforms the 
Title: Hindu mythological wars
Content:  A single arrow was enough to destroy all opponents in any war, and it would then return to Barbarika's quiver. ; Trishula (Trident): The trident of Shiva. Mahadeva literally means "Highest of all gods" i.e. God of Gods. He is the supreme God in Shaivism sect of Hinduism. Shiva is also known as Maheshwar, "the great Lord", Mahadeva, the great God, Shambhu, Hara, Pinakadharik (pinakapani- South India notation), "bearer of the Pinaka" and Mrityunjaya, "conqueror of death". He is the spouse of Shakti. He also is represented by Mahakala and Bhairava. Shiva is often pictured holding the damaruka, an hourglass-shaped drum, along with his trishula, a trident-staff. His usual mantra is Om Namah Shivaya. Shiva is also considered as 
Title: Shiva
Content:  the Sanskrit root śarv-, which means "to injure" or "to kill", interprets the name to connote "one who can kill the forces of darkness". The Sanskrit word śaiva means "relating to the god Shiva", and this term is the Sanskrit name both for one of the principal sects of Hinduism and for a member of that sect. It is used as an adjective to characterize certain beliefs and practices, such as Shaivism. The Vishnu sahasranama interprets Shiva to have multiple meanings: "The Pure One", and "the One who is not affected by three Guṇas of Prakṛti (Sattva, Rajas, and Tamas)". Shiva is known by many names such as Viswanatha (lord of the universe), Mahadeva, Mahandeo, Mahasu, Mahesha, Maheshvara, Shankara, Shambhu, Rudra, Hara, Trilochana, Devendra (chief of the gods), 
Title: List of Hindu deities
Content: Ardhanarishvara ; Nataraja ; Pashupati ; Rudra ; Dakshinamurthy ; Ravananugraha ; Vaidheeswara ; Virupaksha ; Lingodbhava ; Bhikshatana ; Sri Manjunatha ; Jyotirlinga Forms, The 12 divine representations of Lord Shiva ; Bholenath ; Maheshwara ; Budhakedar Vrûdhā/वृद्ध (Old) form of Shiva who guided Pandavas to Swargarohini. Shaivism is one of the major Hindu sects. Adherents of Shaivism believe that the god Shiva is the supreme being. Shiva is the destroyer god among the Trimurti, and so is sometimes depicted as the fierce god Bhairava. Shaivists are more attracted to asceticism than adherents of other Hindu sects, and may be found wandering with ashen faces performing self-purification rituals. Some alternative forms of Shiva (and Bhairavs) are listed below:
Title: Hindu iconography
Content:  The word ‘Shivalinga’ is a combination of the words ‘Shiva’ (auspiciousness) and linga (sign or symbol). Thus ‘Shivalinga’ is a representation of God in His all-auspicious aspect. Again ‘Shiva’ also means ‘One in Whom all creation sleeps after dissolution’. ‘Linga’ also means the place of dissolution of the disintegrated universe. The Shiva linga represents the supreme creator, the cause behind the creation, protection, and destruction of everything visible and invisible and the god shiva.

Question: what does god shiva represent?
Answer: Hinduism.