Letters of an alphabet and variables of mathematic equations. And yet so many hidden meanings behind them. Ideas, history, art and culture are just some of them. In between societies, countries and scientific fields, we often observe them change appearance and use. However, they never quit bearing all those different meanings they carried for centuries. Letters we may not know, but always seem familiar. Unique letters, thus dependable parts of a larger image, of a whole where no loss can be forgiven.