Greek Common Greek symbols used in medical imaging. (If Greek symbols are MRI related, yellow marked links lead to definitions at MR-TIP.com. π (pi) Ratio of the Circumference of the Circle to its Diameter (~3.1415) τ (tau) Time Delay The more severe the pain or illness, the more severe will be the necessary changes. These may involve breaking bad habits, or acquiring some new and better ones. - Peter McWilliams |