A beautifully crafted sign playing on the name of Forth Street and the well known NZ supermarket franchise, Four Square. The Four Sqaure man was designed by the parent company, Foodstuffs, in the 1950s. 
 Carl Walrond, ‘Food shops – Grocers’, Te Ara – the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/en/artwork/25476/the-four-square-man (accessed 8 March 2017)
I’m unsure of the meaning of this name, possibly it’s a take on a Greek style fraternity or sorority names (eg ZETA).
Beautiful paint job on what appears to be an upside down single bed- head. Bed heads have, over the last 20 years particularly, formed a popular medium for flat signs in Dunedin.
Other examples of signs utilising the humble bedhead are: The Hilton and Bedrock on Clyde Street, DSIR on Union Street, and The Changing Rooms on Leith Street.