Christian symbolism is the use of symbols, including archetypes, acts, artwork or events, by Christianity. It invests objects or actions with an inner meaning expressing Christian ideas.

The symbolism of the early Church was characterized by being understood by initiates only, while after the legalization of Christianity in the 4th-century more recognizable symbols entered in use. Christianity has borrowed from the common stock of significant symbols known to most periods and to all regions of the world.

Christianity has not generally practised Aniconism, or the avoidance or prohibition of types of images, even if the early Jewish Christians sects, as well as some modern denominations, preferred to some extent not to use figures in their symbols, by invoking the Decalogue's prohibition of idolatry.

The cross, which is today one of the most widely recognised symbols in the world, was used as a symbol from the earliest times. This is indicated in the anti-Christian arguments cited in the Octavius of Minucius Felix, chapters IX and XXIX, written at the end of that century or the beginning of the next, and by the fact that by the early 3rd century the cross had become so closely associated with Christ that Clement of Alexandria, who died between 211 and 216, could without fear of ambiguity use the phrase τὸ κυριακὸν σημεῖον (the Lord's sign) to mean the cross, when he repeated the idea, current as early as the Epistle of Barnabas, that the number 318 (in Greek numerals, ΤΙΗ) in Genesis 14:14 was a foreshadowing (a "type") of the cross (T, an upright with crossbar, standing for 300) and of Jesus (ΙΗ, the first two letters of his name ΙΗΣΟΥΣ, standing for 18), and his contemporary Tertullian could designate the body of Christian believers as crucis religiosi, i.e. "devotees of the Cross". In his book De Corona, written in 204, Tertullian tells how it was already a tradition for Christians to trace repeatedly on their foreheads the sign of the cross.

William Michael Albert Broad (born 30 November 1955), better known by his stage name Billy Idol, is an English rock musician. A member of the Bromley Contingent of Sex Pistols fans, Idol first achieved fame in the punk rock era as a member of the band Generation X. He then embarked on a successful solo career, aided by a series of stylish^{[citation needed]}music videos, making him one of the first MTV stars. Idol continues to tour with guitarist Steve Stevens and has a worldwide fan base.^{[citation needed]}

Idol was born in Stanmore, Middlesex, the son of a salesman.. The name Billy Idol was inspired by a schoolteacher's description of Broad as "idle".

In 1958, when Idol was two years old, his parents moved to Patchogue, New York, on Long Island. The family returned to England four years later with Idol and a younger child Jane (who had been born in the US), settling in Dorking, Surrey. In 1971 the family moved to Bromley, southeastern London, where Idol attended Ravensbourne School for Boys. Idol (rather William Broad) also attended Worthing High School for Boys (later becoming Worthing College), in West Sussex. In October 1975, Idol went to the University of Sussex, near Brighton, to pursue an English degree and lived on campus (East Slope) but left after year one (1976). He then went on to join the Bromley Contingent of Sex Pistols fans, a loose gang that travelled into town when the band played.

Paul Johannes Tillich (August 20, 1886 – October 22, 1965) was a German-American theologian and Christian existentialist philosopher. Tillich was one of the most influential Protestant theologians of the 20th century. Among the general public, he is best known for his works The Courage to Be (1952) and Dynamics of Faith (1957), which introduced issues of theology and modern culture to a general readership. Theologically, he is best known for his major three-volume work Systematic Theology (1951–63), in which he developed his "method of correlation": an approach of exploring the symbols of Christian revelation as answers to the problems of human existence raised by contemporary existential philosophical analysis.

Tillich was born on August 20, 1886, in the small village of Starzeddel Silesia which was then part of Germany. He was the oldest of three children, with two sisters: Johanna (b. 1888, d. 1920) and Elisabeth (b. 1893). Tillich’s Prussian father Johannes Tillich was a conservative Lutheran pastor of the Evangelical State Church of Prussia's older Provinces; his mother Mathilde Dürselen was from the Rhineland and was more liberal. When Tillich was four, his father became superintendent of a diocese in Schönfliess, a town of three thousand, where Tillich began elementary school. In 1898, Tillich was sent to Königsberg Chojna to begin gymnasium. At Königsberg, he lived in a boarding house and experienced loneliness that he sought to overcome by reading the Bible. Simultaneously, however, he was exposed to humanistic ideas at school.