Nextera XT: Name of Adapters on Tn5?

[JVGen]

In the Nextera XT library prep, what is the name of the adapter that are loaded onto Tn5? I've been referring to them as P5/P7, but in reality that is the name of the sequences that bind the flow cell. I've seen i5/i7 to reference the index sequences, but I've never seen anything references the adapter sequences in Tn5. I am getting ready to publish a custom workflow, so I want to get the terminology correct.

Thanks!