Where is acupuncture zero point?

Point Zero is on the auricle (fleshy part of the ear). Specifically, it is found in the center of the ear, where the helix (outside ridge) curves around back to the center of the ear. Point Zero is located at the end of this ridge.

For a visual map, see:
http://www.yinyanghouse.com/theory/auricular/acupuncture_chart