ric on Nostr: What does OP stand for?

{ "id": "b48a7be39bc3bc9cdd44e061f19265c5065d567aa245d3db07e6a8ef91b8d50a", "pubkey": "c26cf69ad340beae6db8df1faa580c3bcd7f6ffc558b8fefdf4c0449df77bb51", "created_at": 1735413986, "kind": 1, "tags": [ [ "e", "94d09e5554c96c989f1c34a7c4d43ab66ba4f33b6f823a31068e571397220aa5", "", "root" ], [ "p", "bdf02ee67066fdeba255e1ac77d67ad95048ded50eb885a01cab39156e4282df" ] ], "content": "What does OP stand for?", "sig": "9d1a6082432c1145935b6cc1571373a0025964240eb33c3ca4542ab697767014191c3c0ba2256deffce177835152e405bd00f306310754d02b25a096e26a6fd3" }