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Swayambhu ( sa, स्वयंभू) is a Sanskrit word that means "self-manifested", "self-existing", or "that is created by its own accord".
Often, the word swayambhu is used to describe a self-manifested image of a deity, which was not made by human hands, but instead is naturally arisen, or generated by nature.
According to the Ramayana and Mahabharata, Vishnu is called swayambhu.
The word etymology of swayambhu is 'Svayam' (स्वयं) which means 'self' or 'on its own' and 'bhū' (भू) which means 'to take birth' or 'arising'. This is applicable to the physical and tangible idols of Gods that we see or to the intangible yet existing God whom we cannot see. For example, the 
Inside the high Amarnath Cave, the stalagmite is formed due to the freezing of water drops that fall from the roof of the cave onto the floor and grows up vertically from the cave floor. It is considered to be a
jyotirlinga
A Jyotirlinga () or Jyotirlingam, is a devotional representation of the Hindu god Shiva. The word is a Sanskrit compound of ('radiance') and ('sign'). The Śiva Mahāpurāṇam (also ''Shiva Purana'') mentions 64 original ''jyotirlinga'' s ...
s are considered swayambhu- the idol of Venkateshwara
Venkateswara, also known by various other names, is a form of the Hindu god Vishnu. Venkateswara is the presiding deity of the Tirumala Venkateswara Temple, located in Tirupati, Sri Balaji District, Andhra Pradesh, India.
Etymology
Venkatesw ...
at Tirumala and some other ones are considered Swayambu- which means they are not installed by any person but they exist on their own. The word Swayambhu is also applicable to Gods- for example- Vishnu is described as swayambhu in Ramayana and Matsya purana.
As per the Vedas, Shiva is considered swayambhu.
The Ice Lingam at Amarnath Cave
Inside the high Amarnath Cave, the stalagmite is formed due to the freezing of water drops that fall from the roof of the cave onto the floor and grows up vertically from the cave floor. It is considered to be a Shiva Linga
A lingam ( sa, लिङ्ग , lit. "sign, symbol or mark"), sometimes referred to as linga or Shiva linga, is an abstract or aniconic representation of the Hindu god Shiva in Shaivism. It is typically the primary ''murti'' or devotional im ...
by Hindus. The Cave waxes from May to August, as the snow melts in the Himalayas above the cave, and the resultant water seeps into the rocks that form the cave and gradually wanes thereafter. As per the religious beliefs, it has been claimed that the lingam grows and shrinks with the phases of the moon, reaching its height during the summer festival.
Shiva Temples
* Keesaragutta Temple, Hyderabad *Lord Navanepattayya Swamy Temple
Lord is an appellation for a person or deity who has authority, control, or power over others, acting as a master, chief, or ruler. The appellation can also denote certain persons who hold a title of the peerage in the United Kingdom, or are ...
. Aspari
Aspari is a village under the adoni revenue division in Kurnool district of Andhra Pradesh, India
India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-mos ...
, Andhra Pradesh.
*Shanaleshwara Swayambhu Temple, Nalas, Rajpura, Punjab, India, Punjab.
*Thiruvairoor Sree Mahadeva Temple, Chunakkara, Alappuzha district, Kerala
*Gyanvapi shivling, Varanasi.
Ganesha Temples
*Swayambhu Sri Abhista Gnana Ganapathi Temple *Hattiangadi#Siddivinayaka Temple, Hattiangadi Siddi Vinayaka TempleSee also
* Acheiropoieta in the Christian tradition, literally, "works made without human hands" * Perceptions of religious imagery in natural phenomena * Swayambhunath * Soyombo symbolReferences
Hindu philosophical concepts Perceptions of religious imagery in natural phenomena Salakapurusa {{Hindu-philo-stub