Greek Common Greek symbols used in medical imaging. (If Greek symbols are MRI related, yellow marked links ![]() π (pi) Ratio of the Circumference of the Circle to its Diameter (~3.1415) τ (tau) Time Delay There is a theory which states that if ever anybody discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another theory which states that this has already happened. - Douglas Adams |