Question: Vinayak Damodar Savarkar coined which term, which became an official ideology of the Bharatiya Janata Party?

Context paragraphs:
The Indian War of Independence (book): The Indian War of Independence is an Indian nationalist history of the 1857 revolt by Vinayak Damodar Savarkar that was first published in 1909.  The book, initially written in Marathi, was penned by Savarkar in response to celebrations in Britain of the 50th anniversary of the 1857 Indian uprising with records from India Office archives and the whole project received support from Indian nationalists in Britain including the likes of Madame Cama, V.V.S. Iyer and M.P.T. Acharya, as well as Indian students who had dared not show their support or sympathy for India House openly.  Published during Savarkar's stay in London at the India House, the book was influenced by histories of the French Revolution and the American Revolution, as much as it sought to bring the Indian movement to public attention in Britain as well as to inspire nationalist revolution in India.

Ratnagiri Hindu Sabha: The Ratnagiri Hindu Sabha was established with the object of "organising and consolidating the Hindus into an organic whole with a view to enabling them to resist effectively any unjust aggression, and protecting their cultural, economic and religious rights".  The Sabha reconverted many persons to the Hindu faith, its mixed caste schools reduced the number of converts which the American Mission School could make.  The programme of re-conversion was opposed by Christian, Muslim missionaries and the Hindu orthodoxy.  Describing its formation Keer writes that it was "established ostensibly through the influence and attempts of Babarao Savarkar, but, in fact, inspired by Vinayak Damodar Savarkar himself", he dates the establishment at two weeks after the internment of Savarkar in Ratnagiri, on January 6, 1924.

Prashant Thakur: Prashant Thakur (Marathi: प्रशांत ठाकूर ) is a politician in Panvel contesting the 2014 Maharashtra Elections as a candidate from the Bharatiya Janata Party.  He is Member of the Legislative Assembly of the 188 Panvel Constituency (Vidhan Sabha) for the Bharatiya Janata Party (BJP) also holding the responsibility as Bharatiya Janata Party (BJP) President of Raigad district.

Tapir Gao: Tapir Gao (born 1 October 1964) is an Indian politician.He is the President of Arunachal Pradesh, Bharatiya Janata Party.  He was a member of the 14th Lok Sabha of India, representing the Arunachal East constituency of Arunachal Pradesh and the Bharatiya Janata Party.  Gao was General Secretary of Bharatiya Janata Party in 2011 & Gao is currently National Executive Member of BJP.

Jual Oram: Jual Oram (born 22 March 1961) is a member of the 16th Lok Sabha of India.  He represents the Sundargarh constituency of Odisha and is a member of the Bharatiya Janata Party (BJP).  He was also a member of the 12th, 13th and 14th Lok Sabha.  He was chosen as one of the Cabinet Ministers of Prime Minister Narendra Modi.  He is a former Cabinet Minister in the Government of India.  He is now the Vice-President of the Bharatiya Janata Party and is one of the party's senior most leaders from the State of Odisha, being one of two founding Legislative Assembly Members from the Bharatiya Janata Party in the state of Odisha.  He has served as the president of the Bharatiya Janata Party in the state of Orissa for over four years.

Vinayak Damodar Savarkar: Vinayak Damodar Savarkar (   ) (28 May 1883 – 26 February 1966, commonly known as "Swatantryaveer Savarkar") was an Indian pro-independence activist, lawyer, politician, poet, writer and playwright.  He advocated the reconversion of the converted Hindus back to Hindu religion.  Savarkar coined the term "Hindutva" (Hinduness) to create a collective "Hindu" identity as an essence of Bharat (India).  His political philosophy had the elements of utilitarianism, rationalism and positivism, humanism and universalism, pragmatism and realism.  .  Savarkar was also an atheist and a staunch rationalist who disapproved of orthodox beliefs in all religions

Mercy Petitions of Vinayak Damodar Savarkar: " Vinayak Damodar Savarkar" (28 May 1883 – 26 February 1966) was an Indian pro-independence activist Savarkar who published "The Indian War of Independence" about the Indian rebellion of 1857 that was banned by British authorities.  He was arrested in 1910 for his connections with the revolutionary group India House.  Following a failed attempt to escape while being transported from Marseilles, Savarkar was sentenced to two life terms of imprisonment totaling fifty years and was moved to the Cellular Jail in the Andaman and Nicobar Islands, but released in 1921.

Abhinav Bharat Society: Abhinav Bharat Society (Young India Society) was a secret society founded by Vinayak Damodar Savarkar and his brother Ganesh Damodar Savarkar

Veer Savarkar (film): Veer Savarkar is a Hindi language 2001 Indian film based on the life of Vinayak Damodar Savarkar.  This version was released on DVD format.  This film was produced by Savarkar Darshan Prathisthan, under the president-ship of Sudhir Phadke.  It premiered on 16 November 2001, in Mumbai, New Delhi, Nagpur and six other Indian cities.  Rediff.com reports a claim that it is the first movie in the world financed by public donations.  On 28 May 2012 its Gujarati language version was released by the then Chief Minister of Gujarat, Narendra Modi.

Hindutva: Hindutva ("Hinduness"), a term popularised by Vinayak Damodar Savarkar in 1923, is the predominant form of Hindu nationalism in India.  The Bharatiya Janata Party (BJP) adopted it as its official ideology in 1989.  It is championed by the Hindu nationalist volunteer organisation Rashtriya Swayamsevak Sangh (RSS) and its affiliate organisations, notably the Vishva Hindu Parishad.

Supporting paragraphs: Vinayak Damodar Savarkar Hindutva
Answer: Hindutva