S and ton have their own meanings. S generally has many meanings in mathematics, and tons represented by T also has many meanings in mathematics. S means area, standard deviation and second in mathematics. S represents the graphic area in geometry, and the area is the size of a plane graphic. S stands for standard deviation, and s2 stands for variance in statistics. Variance is a measure of dispersion when probability theory and statistical variance measure random variables or a set of data. The lowercase s is the symbol of seconds, and seconds are the unit of time. T stands for time mathematically, and it can also stand for ton. Time is one of the seven basic units in mathematics and physics. The symbol is T, and sometimes it is abbreviated as sec. Ton is often used as a unit of mass in mathematics and physics, and the symbol is lowercase t. The combination of the two is actually meaningless, just two symbols.