Mesh Blocks are the smallest geographical area defined by the Australian Bureau of Statistics (ABS) and form the building blocks for the larger regions of the Australian Statistical Geography Standard (ASGS). The ABS’s mesh blocks divide Australia into almost 370,000 unique and non-intersecting blocks each with their own unique identifying code and data.
All other statistical areas or regions are built up from or, approximated by whole mesh blocks. 1
1 See further Mesh Blocks | Australian Bureau of Statistics (abs.gov.au)