 as for the leech it is the leech. its interpretation is that the uvula is raised and the finger is inserted into the throat scratching the throat with it or with a stick until it bleeds.
وأما العلق فهو الأعلاق وتفسيره أن يرفع اللهاة ويدخل الإصبع في الحلق فيخدش الحلق بها أو بعود حتى يدمى.