Ogham was not alphabet in the sense that Greeks or Romans understood the term. It was mark-making—notches cut along the edge of wood or stone, each notch representing a sound, each group of notches forming a word. But these marks served different purposes than Greek letters or Roman capitals. They did not record sacred knowledge. They did not preserve poetry or law or mythological lore. The Druids forbade such recording, understanding that knowledge written becomes knowledge dead—frozen, unable to adapt, severed from the living voice that should transmit it. Ogham existed in the liminal space between the spoken and the inscribed, between the permanent and the temporary, between silence and speech. It marked boundaries. It named the dead. It claimed territory. It honored trees. And it did all this while somehow remaining not-quite-writing, preserving the Druidic prohibition even as it carved letters into wood and stone.
The script’s appearance is stark, almost brutal in its simplicity. A vertical line—the druim or “spine”—runs along the edge of the inscribed surface. Crossing this line at right angles are groups of one to five shorter lines, the feda or “letters.” The pattern resembles a tree’s central trunk with branches radiating outward, or a human spine with ribs extending from it. This visual structure was not accidental. Ogham was the tree alphabet. Each letter was named for a tree or plant, and through that naming, each letter carried the qualities, mythological associations, and practical properties of its corresponding species.