This page contains spoilers about the Heartbound ARG. If you want to solve the puzzle yourself, avoid reading this article.
We don't know much about the Guardian Glyphs at this time. They're used for casting spells, and a couple pages in a book are written in them.
If you enter the following code before starting the game, you'll hear a faint laughter, and the in-game guardian glyphs will be translated for you:
Guardian Glyphs Translation Table
|English Letter||Glyph||English Letter||Glyph||English Letter||Glyph||English Letter||Glyph|