Proper noun
Middle Scots
The Anglic language of Lowland Scotland in the period from 1450 to 1700.
After the development of printing In Middle Scots orthography the use of yogh became confused with a cursive z and the early Scots printers often used z when yogh was not available in their fonts. Source: Internet
In Middle Scots the character yogh became confused with a cursive z and the early Scots printers often used z when yogh was not available in their fonts. citation. Source: Internet
Possible French etymologies It may have been introduced to Middle Scots via French. Source: Internet