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1 omphaloskepsis - Contemplation of one's navel as an aid to meditation.  navel, umbilicus, belly button, omphalodium - The navel is also the umbilicus, belly button, or omphalodium; navel and umbilicus share the same Indo-European root.
What is the Anterior Cruciate Ligament - ACL? The anterior cruciate ligament (ACL) is one of four ligaments critical to stabilizing the knee joint. A ligament is made of tough fibrous material and functions to control excessive motion by limiting joint mobility. Of the four major ligaments of the knee, the ACL is the most frequently injured.