Shiva had many forms and formless Linga as well. His five faces are described in Vedas and Agamas. They are Satyojata, Vamadeva, Agora, Tatpurusha and Isana. Puranas describe these five aspects of Shiva as the five elements, the five senses, the five organs of perception, and the five organs of action.. Five faced Shiva is called Panchanana Shiva and a hymn is also there. Four faces look at four different directions and the fifth looks at the sky. Each is attributed with different colour and action.
Ishana: Also known as Sadashiva, Ishana Shiva is associated with Anugraha Shakti (power of blessing).
Tatpurusha: Also known as Maheshwara, Tatpurusha Shiva is associated with Thoridhana Shakti (power of concealment).
Aghora: Also referred to as Rudra, Aghora Shiva associates with Samhara Shakti (power of dissolution).
Vamadeva: Also termed as Vishnu, Vamadeva Shiva is associated with Stithi Shakti (power of sustenance).
Sadyojata: Also named as Brahma, Sadyojata Shiva is associated with Srishti shakti (power of creation)
There is a popular deity of Panchamukha Shiva at Elephanta Caves near Mumbai Metropolis which displays only three faces of Panchamukha Shiva.
Shiva Panchanana Stotram
Praleyachala mindu kunda davalam goksheera phena prabham,
Bhasmabhyanga mananga deha dahana jwaala valee lochanam,
Vishnu brahmarul ganarchitha padanjargwedha nadhodhayam,
Vandeham sakalam kalanga rahitham Sthanormukham paschimam.,
I salute the western face of the ever stable God,
Who is everything and without any trace of stain,
Who is as white as snow mountain, moon and the jasmine,
Who is as shining as the foam of the boiling milk,
Who has a body applied with white sacred ash,
Who has eyes which burnt the body of god of love,
Who is worshipped by Vishnu, Brahma and Ganas,
And whose reverberations give rise to Rig Veda.
Gouram kumkuma pangilam suthilakam vyapandu ganda sthalam,
Broovikshepa kadaksha veekshshana lasad samsaktha karnodhphalam,
Snighdham bimbaphaladharam prahasitham neelala kalamkrutham,
Vande yajusha veda gosha janakam vakthram harsyotharam.,
I salute the northern face of Lord Shiva,
Which gives rise to the sound of Yajur Veda,
Who is white and has a thilaka of Kumkum,
Who shines with an extremely white neck,
Who shines with shifting side long glances,
Who is affectionate and has lips as red as a cherry,
And who is pretty with his blue hair locks and his smile.
Samvarthagni thadith prathaptha kanaka praspardhi thejo mayam,
Gambeera dhwani sama veda janakam thamradharam sundaram,
Ardhendu dhyuthi phaala pingala jata bhara prabhadhoragam,
Vande sidha surasurendra namitham poorvam mukham soolina.,
I salute the eastern face of the holder of the trident,
Who is worshipped Sidhas, devas, asuras and their kings,
Who has more shine than the Gold purified again and again,
Who is the source of Sama Veda recited in regal tone,
Who has red pretty lips of the colour of copper,
And who has decorated his matted locks,
With the crescent of the moon and a serpent.
Kalabhra bramaranjana dhyuthi nibham vyavartha pingekshanam,
Karnodhbasitha bhoghi masthaka maniprothphulla damshtrakuram,
Sarpa prothaka pala shukthisaka lavyakeernasachhekaram,
Vande dakshina meswarasya vadanachaadharva vedhodhayam.,
I salute the southern face of the God of all,
Which gives rise to the Atharva Veda,
Who has the shine of black cloud, bee and Collyrium,
Who has brown eyes which rotate,
Who has teeth which are clearly seen in the shine in the light,
Of the Gem in the heads of the snakes which reside in his ears,
And who has the shine of the crescent in the head decorated by the snake.
Vyaktha vyaktha niroopitham cha paramam shad thrimsa thathwadhikam,
Thasmad uthara thatwa maksharamithi dheyyam sada yogibhi,
Omkaaradhi samastha manthra janakam sookshmadhi sookshmam param,
Vande panchamamneeswarasya vadanam Kham vyapi thejo mayam.,
I salute that fifth face facing the sky of Iswara,
Which is divine and greater than greatest,
Which is greater than the thirty six principles,
That cannot be classified as clear or unclear,
Which is meditated upon by great sages,
As the greatest and deathless principle,
Which is the origin of mantras like “Om”,
And which is smaller than the smallest.
Yethani pancha vadananbi Maheswarasya,
Ye keerthayanthi purusha sathatham pradoshe,
Gachanthi they Shiva purim ruchirair vimanai,
Kredanthi nandana vane saha loka palai.
Than man who reads this great prayer,
Addressed to the five faces of the great God,
Without fail on the Pradosha days,
Would travel in a pretty airplane to the town of Shiva,
And would spend his time playing with Gods.