Christian Symbols & Their Meanings

Why the cross came late

The earliest surviving Christian art does not centre the cross, and this is not an accident of preservation. Crucifixion was a live, degrading Roman punishment reserved largely for slaves and rebels; the second-century Alexamenos graffito, which mocks a Christian by depicting him worshipping a crucified figure with a donkey's head, shows exactly how the image read to outsiders at the time. Believers used the fish, the anchor, the Good Shepherd and the Chi-Rho instead.

Constantine's abolition of crucifixion as a judicial penalty in the fourth century removed the obstacle. Within a few generations the cross moves to the centre — first as a jewelled, triumphal crux gemmata that emphasises victory rather than suffering, and only much later, from around the eleventh century, as the realistic depiction of a suffering body that most people now picture. The devotional emphasis on Christ's physical agony is a medieval development, not an original one.

Cross forms and what distinguishes them

The Latin cross has a lower vertical arm and dominates Western usage. The Greek cross has four equal arms and dominates Byzantine and Eastern usage, where it also structures church floor plans. The Russian Orthodox cross adds an upper titulus bar and a slanted lower footrest, the slant carrying a specific tradition about the two thieves. The Coptic cross is typically equal-armed with three points on each arm, read as the Trinity. The Celtic high cross rings the intersection, a form that appears in Ireland and Britain from around the eighth century and whose origin is genuinely disputed rather than settled.

These distinctions matter practically. Choosing a cross form is choosing a tradition, and forms that read as neutral to one viewer read as denominational to another. The Jerusalem cross, for instance, carries Crusader associations that are actively contested; the Iron Cross and the Maltese cross have both been pulled into military and, in the Iron Cross's case, extremist usage that has nothing to do with their origins.

Signs borrowed from Judaism, and the honesty problem

A substantial part of the Christian repertoire is Jewish imagery read typologically — that is, reinterpreted as pointing forward to Christian claims. The tree of Jesse, the menorah, the Passover lamb, the brazen serpent and the Ark all function this way. Typology was a genuine interpretive method with a long internal history, and it produced some of the tradition's richest visual material.

It is also the point where the tradition's symbols carry the most historical weight, because the same interpretive move underwrote centuries of supersessionist theology and, at its worst, the iconography of Christian antisemitism — the paired Ecclesia and Synagoga figures on medieval cathedral portals being the standard example, with Synagoga blindfolded and her staff broken. None of this makes the underlying symbols unusable. It does mean that describing a menorah as a Christian symbol, without noting that it is a living Jewish one first, gets the history backwards.

Marian, saintly and attribute symbols

A large secondary vocabulary developed to identify individual figures in art for a largely non-reading audience. Saints carry attributes, usually drawn from the manner of their death or a defining episode: Peter with keys, Catherine with a wheel, Lawrence with a gridiron, Sebastian with arrows. Once established, the attribute becomes readable on its own — a set of crossed keys means Peter, and by extension the papacy, without any figure attached.

Marian symbolism runs on a parallel track and draws heavily on flowers and enclosed spaces: the lily for purity, the rose for both her and, through the rosary, for the structure of devotion itself, the hortus conclusus or enclosed garden for virginity, the crescent moon from the woman of Revelation. Much of this crystallises in the high medieval period and is elaborated enormously in Counter-Reformation art, which is why Marian imagery is far denser in Catholic and Orthodox visual tradition than in Protestant ones.

The animal and plant vocabulary, and where it came from

A large secondary layer of Christian symbolism is bestiary material, and its main channel into Europe was the Physiologus — a Greek text compiled in Alexandria, probably in the second or third century, which described animals real and imagined and attached a moral or doctrinal reading to each. It was translated into Latin, Syriac, Armenian, Ethiopic and eventually most European vernaculars, and it is one of the most widely circulated books of the medieval period after the Bible itself.

Several of its readings became standard and remain legible today. The pelican was believed to wound its own breast to feed its young with blood, which made it a eucharistic emblem of enormous popularity in medieval and Renaissance art. The phoenix, borrowed from classical sources, became a resurrection sign. The lion was said to breathe life into stillborn cubs after three days. The unicorn, tameable only by a virgin, entered Marian iconography by that route. Almost none of these behaviours is real, and that did not matter — the text was read as a book of meanings rather than a book of zoology.

The plant vocabulary works on a different principle, usually scriptural reference or observable property. The vine and branches come directly from a Gospel image, the palm from the entry into Jerusalem and from earlier classical victory usage, the lily from Marian purity, the olive from the Noah narrative. The passionflower is the most elaborate case: sixteenth-century Spanish missionaries in South America read the flower's structure as a complete diagram of the crucifixion — the corona as the crown of thorns, three stigmas as the nails, five anthers as the wounds — and named it accordingly. It is one of the few instances where an entire symbol was constructed and named within a documented decade.

What the Reformation removed

Any account of Christian symbolism that treats it as one continuous tradition misses the largest deliberate break in its history. Sixteenth-century Reformed iconoclasm — in Zurich, Geneva, the Netherlands, Scotland and England — destroyed images and stripped churches on theological principle, reading much devotional imagery as a violation of the commandment against graven images.

The consequence is that the symbol vocabulary of, say, a Scottish Presbyterian congregation and an Italian Catholic one diverge sharply while sharing a scripture. Plain-style Protestant traditions retained the cross, the open book and a handful of scriptural emblems while rejecting saintly attributes, Marian imagery and relic-associated signs almost entirely. This is why questions of the form what does this Christian symbol mean often have no single answer: they have a Catholic answer, an Orthodox answer, a Lutheran answer and a Reformed answer, and those answers were argued over at length.