In the periodic table, Potassium's symbol is the letter K.

The answer is True because in the periodic table, potassium's symbol is indeed the letter K. The symbols used in the periodic table are generally derived from the element's name, but in some cases, they are derived from the element's Latin name. The symbol K comes from the Latin name of potassium, "kalium." It is a universally accepted convention in chemistry to represent potassium with the symbol K, making the statement "potassium's symbol is the letter K" true.