The Letter X: Mark, Mystery and Meaning

The letter X has long occupied a strange and layered position in human communication — at once familiar and unresolved, simple in form yet endlessly open in meaning. It is a symbol that seems to resist settling into a single definition, instead shifting between mystery, certainty, danger, affection, and absence.

One of its most enduring associations is with the unknown. In mathematics, x is used to represent an unknown quantity — something to be solved, uncovered, or brought into understanding. This sense of enigma extends far beyond equations. In popular culture, it appears in narratives of investigation and secrecy, from The X-Files to countless detective stories, where the “X” signals something hidden beneath the surface, waiting to be revealed.

Yet paradoxically, X is also used to mark certainty and location. On treasure maps it indicates “the spot,” a fixed point of arrival or discovery. In this way, the symbol holds both uncertainty and resolution at once — it is both the question and the answer.

Its social meanings are equally complex. An X can stand in for a signature, historically used by those who could not read or write, transforming it into a mark of presence and consent. It appears again on ballot papers, where a simple cross becomes an act of civic participation — a quiet, decisive gesture that carries weight far beyond its form.

At the same time, X can denote warning or prohibition. In maritime and pirate imagery it is associated with danger, skulls and crossbones, and in modern systems it marks toxic or hazardous substances. X-rated means for adults only. In education, a teacher’s X can signify error — something incorrect, a deviation that requires correction or attention.

And yet, despite these associations with risk and error, X is also deeply intimate. It appears at the end of letters, emails, and messages as a symbol of a kiss — a small gesture of affection and closeness, embedded within everyday communication. It is also a numeral, representing ten in Latin contexts, and carries religious significance as an abbreviation of Christ in Greek, linking it to ideas of faith, continuity, and transcendence.

Taken together, these meanings form a constellation of contradiction: X as unknown and known, wrong and affectionate, danger and devotion, absence and presence. It is precisely this instability that makes it such a powerful symbol — one that resonates with ideas of transition, ambiguity, and meaning in flux.

Within my ceramic practice, I am drawn to this layered ambiguity. The X becomes a way of thinking about connection across time — linking lost generations to future generations through repeated ritual, gesture, and making. Like a mark pressed into clay, it is both an assertion and an uncertainty: a trace of something that was, and a possibility of something yet to come.