᚛ᚈᚑᚋ ᚄᚉᚑᚈᚈ᚜ and ᚛ᚑᚌᚐᚋ᚜
Ogham is an old Irish script made by carving notches into stones. It fell out of use more than a millennium ago—but it's an interesting exception to a linguistics and computer-science rule that I'd never even realised existed. Let's talk about the Ogham Space Mark.