Ezh is used for the 's' sound in words like pleasure: ['plɛʒəɹ] (SAMPA: /"pleZ@r/)
In Unicode 1.0 the character was mistakenly unified with the quite different character Yogh, which was not added to Unicode until Unicode 4.0. Ezh as a letter does not appear in any written language, current or historical: Yogh was used in the old English alphabet.
Ezh must not be confused with Yogh (Ȝ/ȝ): Ezh resembles a 'Z' with a tail, while Yogh resembles a Arabic numeral 3 which is placed partially below the baseline.
Ezh is similar in appearance to the 'z' glyph as was used in the German Fraktur script, but it is a different character.