The All Ordinaries is the oldest index of shares in Australia. Established in January 1980, it is made up of the share prices for 500 of the largest companies listed on the Australian Securities Exchange. The market capitalisation of the companies included in the All Ords index amounts to over 95% of the value of all shares listed on the ASX. The 3-letter exchange ticker in Australia for the All Ordinaries is "XAO". ASX indices are managed by S&P Dow Jones Indices. Wikipedia