Australian Standard AS2118 describes (but does not define) the use of a fire sprinkler head baffle plate that is used to prevent the first operating sprinkler from wetting, cooling and adversely affecting the spray pattern of a lower or adjacent fire sprinkler head.
There is an industry term that also describes these plates as a "heat collector plate" which is not used or referenced with AS2118.
This article covers the use of a fire sprinkler head baffle plate consistent with the application set out in AS 2118:2016.
In the image included with this article, the photograph shows a fire sprinkler head with a baffle plate fitted below some water pipes which has a sprinkler head immediately above it. In this case, the baffle plate is smaller than the size set out in the Standard.
Other than the size of the baffle plate, this is a typical use of a baffle plate, consistent with the requirements of the note in Table 188.8.131.52 and the requirements for Clause 5.3.