Search for an ogham inscription online and you’ll almost always see it framed like this: ᚛ at the start, ᚜ at the end, wrapped around the letters like a pair of arrowheads. Type a name into most ogham translator sites and the same brackets appear automatically, every time. They look official. They’re in the Unicode standard. They must be a normal, expected part of writing ogham.
They aren’t. These are called feather-marks, and on the classical period stone pillars that make up the bulk of surviving ogham, they essentially never occur.
Where the Brackets Actually Come From
The term “feather-mark” was coined by R. A. S. Macalister, the early twentieth-century scholar whose catalogue numbers (the CIIC numbers still used to identify individual stones today) remain the standard reference system for the corpus. Macalister described the shape as resembling an arrow shot across the page, with the ᚛ symbol standing in for the fletching at the tail end of the shaft, marking where reading should begin and in which direction.
Unicode encoded the character in 1999, as OGHAM FEATHER MARK (U+169B) and OGHAM REVERSED FEATHER MARK (U+169C), sitting in the punctuation section of the Ogham block alongside the space mark. Once a symbol has a Unicode code point, it tends to get used, and popular transliterator tools and reference sites now insert feather-marks around every inscription by default, whether or not the stone they’re supposedly transcribing has anything of the kind carved on it. That’s how a real but rare epigraphic feature became misrepresented online as a universal one.
What Feather-Marks Were Actually For
On a standing stone pillar, there’s rarely any ambiguity about how to read the inscription. The stone has an obvious base sitting in the ground and a top pointing at the sky, and ogham on stone conventionally runs up one angle, across the top if needed, and down the other. Anyone looking at the pillar in the field can see which way is up.
A portable object doesn’t have that built-in orientation. Pick up a brooch, a bone, or a bowl and turn it in your hand, and there’s no “ground” to tell you where a carved inscription starts. Feather-marks solved a real problem on objects like these: they flagged the starting point and the reading direction on something that could be turned any way at all.
The Genuine Cases Are Rare
Of roughly a dozen surviving portable objects carrying ogham, only three are known to actually use feather-marks. The Ballyspellan brooch, a silver penannular brooch found in County Kilkenny in 1806 and dated to the ninth century, has four separate lines of ogham on its reverse, and Macalister himself noted that “a feather-mark is prefixed to every word” across those lines. The Kilgulbin East hanging bowl, a copper-alloy bowl dug out of a County Kerry bog in 1927, carries two inscriptions, one of which opens with a feather-mark before the name Bladnach. The third known example is an eleventh-century antler comb found at Dublin Castle.
That’s it. Three objects, out of the entire surviving corpus, with confirmed feather-marks. There don’t appear to be any on the ogham graffiti at Knowth, and none on the early ogham manuscript tradition either.
The Classical Stones Never Had Them
The hundreds of standing pillar inscriptions from the fourth to seventh centuries, the “orthodox” period of ogham that produced most of what survives, show no trace of feather-marks at all. The Breastagh stone in County Mayo, a 2.75-metre national monument whose inscription runs plainly up two angles of the pillar, is typical: no bracket, no arrow, just the strokes themselves. The convention belongs almost entirely to a small, later group of portable objects from the reformed ogham period, not to ogham as a whole.
If you’re ever reading a transliteration of a classical-period stone and it comes wrapped in ᚛ and ᚜, that’s a stylistic default from the software generating it, not a feature of the stone. For a fuller sense of how the strokes themselves are actually meant to be read, see our guide to reading ogham, and browse the stones referenced here, along with hundreds of others, on the interactive ogham stone map.
Further Reading
- Forsyth, K., “Feather-marks”, OG(H)AM Project Blog, University of Glasgow, 23 August 2024
- Macalister, R. A. S., Corpus Inscriptionum Insularum Celticarum, Vol. I, Dublin: Stationery Office, 1945
- “Ogham” Unicode block reference, Unicode Consortium
- McManus, D., A Guide to Ogam, An Sagart, 1991