The provided visualization is a block diagram of a system, likely a Fortran program datation.f90 according to the filename. Block diagrams are a common way to depict the overall structure or flow of a system. They use boxes to represent major subsystems or functions, and arrows to depict the flow of data or control between them [https://en.wikipedia.org/wiki/Block_diagram](https://en.wikipedia.org/wiki/Block_diagram).

In the specific block diagram you sent, there are 13 blocks total.  Here’s a list of the blocks, though it is difficult to discern the functionality of each block without more context:

* INIT
* GEOMETRY
* BDY
* SOURCE
* LOOP
* MAT
* RHS
* OUTPUT
* FINALIZE
* SUBROUTINE 1
* SUBROUTINE 2
* SUBROUTINE 3
* SUBROUTINE 4

The arrows show that data or control flows from the INIT block to the GEOMETRY block, then to the BDY block, and so on. There are also arrows that flow in the other direction, such as from the LOOP block to the MAT block. 

Without more context, it is difficult to say exactly what this program does. However, block diagrams are a useful tool for understanding the overall structure of a system, and the one you provided should be helpful to someone who is familiar with the Fortran program datation.f90.