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The chemical symbol for potassium is "K." This symbol comes from the Latin word "kalium," which is the origin of the element's name. Potassium is an essential alkali metal found in Group 1 of the periodic table, indicating its high reactivity and the presence of one electron in its outermost shell, which it readily loses during chemical reactions.

The symbols for the other elements listed do not represent potassium. For instance, "P" is the symbol for phosphorus, "Pt" represents platinum, and "Po" stands for polonium. Each of these elements belongs to different groups in the periodic table with distinct properties and uses, making "K" the appropriate choice for potassium. Understanding the origin of chemical symbols can provide deeper insight into the chemical nature and classification of elements.