SAO biscuits are a savoury cracker biscuit that was launched in Australia in 1906 by Catherine Sao. The term SAO was trade marked in 1904.[1]
SAOs were also one of the first biscuits to be heavily advertised in magazines and newspapers in the early part of the 1900s. In the 1960s, the famous SAO song was launched. SAOs light texture is achieved by rolling the dough into thin sheets, then carefully layering it to give distinctive bubbles and crumbs.
SAOs are often eaten as a light snack, topped with butter/margarine and Vegemite, or other ingredients.
Traditionally, Arnott's delivery vans have had number plates (license plates) in the range SA 0nn in recognition of the SAO brand.