Double subscript (Force) notation confusion?

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influx
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Shouldn't it be Pdc = 22kN rather than Pcd? I mean the 22kN force arrow is pointing towards C? Because Pdc means the P from D to C no?
 

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influx said:
View attachment 81257Pcd is the force of c on d. Pdc is the force of d on c. Free body diagram of cut section 3-3 to D is shown. You can draw FBD of cut section 3-3 to A to get Pdc. Or use Newton 3.
 

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