How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network’s input and output?

A Pi-network is an electrical circuit that resembles the Greek letter Pi, featuring one series element (the horizontal bar) and two parallel or shunt elements (the vertical legs) connected to ground. To function as a low-pass filter, the network must allow low frequencies to pass through to the output while shorting high frequencies to ground. Because an inductor passes low frequencies and blocks high frequencies, it serves perfectly as the series element between the input and output. Because a capacitor passes high frequencies and blocks low frequencies, two capacitors are used as the shunt elements connected to ground on either side of the inductor. This specific arrangement successfully routes high-frequency signals to ground while allowing the desired low-frequency signals to travel unimpeded through the series inductor.