P&ID tag number

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could you tell me what it means by XYX, XHS in the following P&ID of the polypropylene production. thank you.

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XYX is Solenoid valve that is supplying the instrument air(IA) to operate the shut off valve XV10101 and XV10102 XHS is operating open / close command from the control system or control room to the Solenoid valve that is supplying instrument air(IA) to operate the shut off valve XV10101 and XV10102