Looks a surprising amount like a structogram: https://en.wikipedia.org/wiki/Nassi%E2%80%93Shneiderman_diagram https://en.wikipedia.org/wiki/Nassi%E2%80%93Shneid

Looks a surprising amount like a structogram: https://en.wikipedia.org/wiki/Nassi%E2%80%93Shneiderman_diagram https://en.wikipedia.org/wiki/Nassi%E2%80%93Shneiderman_diag...