The hymn Shiva panchākshara stotra is composed by the great advaita philosopher ādi shankara Bhagavadpāda.
This hymn is comprised of six shlokas, the first five shlokas praising lord Shiva and the sixth shloka describing the benefit of chanting the hymn.
The first letter of each of the five shlokas starts with each of the five syllables of the great Shiva panchākshara.