Rudraksham -ॐ नम: शिवाय:

"Rudra" is a name of Lord Shiva whereas "Aksha" means tears. The word Rudraksha has its etymological beginnings in the two Sanskrit words "Rudra" and "Aksha" meaning Lord Shiva and Teardrops respectively. According to "Shiva Purana", Lord Shiva once went into deep meditation for the well being of all living creatures. When he woke up, he opened his eyes and tear drops fell on the Earth. These tear drops took the form of seeds that later on became the Rudraksha tree. Rudraksha therefore means 'The Tear of Lord Shiva'. The dry seed-capsules from the Rudraksha tree form the rudraksha beads, which are being used as a rosary and are also worn as a chain. Lord Shiva is always portrayed wearing rosaries of Rudraksha beads on his head, arms and hands. With this came the religious and spiritual significance of Rudraksha. It is believed that the seed of Rudraksha contains the secrets of the entire evolution of the cosmos within it. The sages and yogis of the himalayas, who live according to the Eternal Natural Law of Sanatana Dharma, have always been wearing Rudraksha for centuries for a fearless life on their path to spiritual Enlightenment and Liberation. Devotees dedicated to Lord Shiva always wear Rudraksha as rosaries which are used in meditation; it helps to maintain good health, to gain self-empowerment and a fearless life. Rudraksha are noted for their divine protection and are worn on the body singly or as chains (Mala). Botanically, the holy rudraksha tree is known as 'Elaeocarpus ganitrus Roxb' and belongs to the family Tiliaceae, a large evergreen broad-leaved tree with a wide crown. Altitude-wise, its habitat starts from sea-coast and goes up to 2,000 meters. Geographically it is found growing naturally and abundantly in tropical and subtropical areas. The trees are perennial in habitat. The trees are almost 15 to 60 meter in height. This tree grows fast and carries these seeds/fruits within seven years. These trees are mostly found in abundance in Nepal, in the Himalayan slopes and also in parts of India, Ind

The single face rudraksha, considered to be the form of Lord Siva, is very rare and unique.  
Two faced rudraksha - Devi.  
The three face rudraksha - Agni.  
The four face rudraksha - Brahma.  
The five face rudraksha - Kalakni Rudra.  
The six face rudraksha - Subramanian.  
The seven face rudraksha - Manmadan.  
The eight face rudraksha - Vinayaga.  
The nine face rudraksha - Bhairava.  
The ten face rudraksha - Vishnu.  
The eleven face rudraksha - Ekadasa Rudra.  
The twelve face rudraksha - Dvada Sadhithas.  
The thirteen face rudraksha - Shanmuga.  
The fourteen face rudraksha - One who is the possesor of such a rudraksha is considered to be an aspect of Lord Siva himself. It is that rare and significant.