What the sources claim for it
In the sources that use it, the three-in-one of the Trinity. Anything earlier is reconstruction.
What is it made of?
One line, three lobes: a single unbroken strand woven so that no lobe can be removed without undoing the others.
Three lobes
The unbroken line
The enclosing ring
Triquetra
- 01
Three lobes — Each a vesica formed where two of three overlapping circles meet.
- 02
The unbroken line — Continuity is the argument — insular manuscripts use the figure precisely because it cannot be taken apart.
- 03
The enclosing ring — Added in many versions and not original to the figure. It is what most modern reproductions copy.
History
Where does the Triquetra come from?
The figure is a constant in Insular Christian art — the Book of Kells, Irish high crosses, Anglo-Saxon and Scandinavian metalwork — and also appears on Norse runestones and coinage. In the manuscripts it sits alongside dozens of other interlace motifs and carries no caption.
The common modern claim that it is an ancient Celtic sign of a triple goddess has no support in any pre-Christian source. What can be documented is later: Christian scribes used it, Christian commentators read it as the Trinity, and twentieth-century revival movements re-read it as something older. Motif, Christian reading, retrospective pagan reading — that sequence is the standard life cycle for a symbol in this corpus.
The larger argument
Why is it in a corpus about spirits?
Insular Christian ornament read backwards into pre-Christian religion by nineteenth- and twentieth-century writers, and now sold as a Celtic pagan symbol. The same failure mode as the inverted pentagram, a different century — which is why every entry here carries a date of first use rather than a tradition of origin.
Afterwards
What did it turn into?
Ubiquitous on jewellery, in television fantasy and in modern pagan practice, generally with the pre-Christian claim attached.
Which texts describe it?
None, and here is why
An ornamental form before it was a symbol of anything. The three-lobed knot is everywhere in insular manuscript and metalwork and carries no caption; the trinitarian reading is later, and the Norse and neopagan readings later still. There is no text to cite because the mark's earliest use is decorative, and a page claiming otherwise would be reading a doctrine off a border pattern.
Nearby
Related marks
The Triple Spiral
Three joined spirals cut into a kerbstone at Newgrange five thousand years ago — older than the pyramids, and completely unexplained.
The Pentagram
A five-pointed star drawn in one unbroken line — an accounting mark, a Pythagorean password, a Christian emblem of the five wounds, and only recently a sign of evil.
The Tetragrammaton
Four letters that stopped being pronounced and became, in consequence, the most powerful thing you could write on a piece of equipment.
The Bronze Serpent
A healing standard that stood in the Temple for centuries until a reforming king smashed it — the Hebrew Bible's own account of a symbol going wrong.
The Sator Square
Five Latin words in a grid that reads the same in four directions, scratched on a wall at Pompeii and still being cut into churches a thousand years later.
Alpha and Omega
First and last letters of the Greek alphabet, used in Revelation as a name — a claim about extent made out of the ordering of a writing system.