This is a type of superannuation fund.
An approved Deposit Fund is a superannuation fund which does not accept contributions but does accept rollovers. See section 10 of the Superannuation Industry (Supervision) Act 1993
a concessionally taxed investment fund for superannuation monies. Similar to a superannuation fund, however an ADF can only accept ETPs (ie superannuation money) and cannot allow contributions. For this reason superannuation funds have become more popular.