Ezh and Yogh
In Unicode 1.0, the character was unified with the unrelated character yogh (Ȝ ȝ), which was not correctly added to Unicode until Unicode 3.0. Historically, ezh is derived from Latin z, while yogh is derived from Latin g by way of insular G. The characters do look very similar, and do not appear alongside each other in any alphabet. To better differentiate between the two, the Oxford University Press and the Early English Text Society extend the uppermost tip of the 'yogh' into a little curvature upward.
Read more about this topic: Ezh (letter)