The three most common toilet pan models in Australia are: S-Trap, P-trap and Skew trap.
S-trap pans are the most common. The simplest way to identify an S-trap is that the waste pipe connects to the floor.
P-trap pans are easily identified as the horizontal waste pipe connects into the wall.
Skew trap pans are an older style toilet pan with the waste pipe extending to either the right or left-hand side of the toilet.