Heh. 
But you’d still probably have to write “edt” rather than just “dt” – initial vowels are required 
Yes, ancient Hebrew was pretty much completely vowelless. Modern Hebrew is “semi-voweled” – and in fact foreign words and names can be (and often are) spelled varyingly. e.g., Chagall could be spelled fully (like in your image), but could also be spelled “ShGL” (which rendering I have seen, albeit rarely)