Actually, this is a tosyl group (abbreviated Ts or Tos) with chemical formula CH3C6H4SO2.
Tosylate refers to the anion of p-toluenesulfonic acid (CH3C6H4SO3−) and it is abbreviated as TsO−, or it may refer to esters of p-toluenesulfonic acid.
Reference: https://en.wikipedia.org/wiki/Tosyl