For thousands of years, lovers have engraved their initials on forest trees as reminders of never-ending love (for better or for worse, as they say) and revered the action as sacred. In modern times, we simply write them on the back of our note books or torn pieces of paper. It’s like a written agreement etched on the wood or signed on a paper of two halves coming together (though once you start carving them, it’s hard to resist to not do that on every surface, anywhere you go!).