This is picture from Lada's fuel gauge.
Any idea why it says 4/4 when the tank is full?
The logical sequence is: 0, 1/2, 1.
4 quarters = 1 complete ie the full tank is divided into 4 equal parts.
But, most if not all fuel gauges are inaccurate - so it may show 3/4 but the amount in the tank may not be that at all or the distance possible...