A peak organisation or peak body in Australia is an association of industries or groups. They are generally established for the purposes of developing standards and processes, or to act on behalf of all members when lobbying government or promoting the interests of the members.
In the commercial sector they allow competing companies to meet to discuss common issues without the risk of breaching the Trade Practices Act which outlaws collusion between competitors which would affect the operation of a free market.
Some examples of Australian wide organisations are,