Wave on Nostr: What is a ordinal?

{ "id": "365ce0b8d2fecde77bb8a19323ef44a38316772646b61ed22578dc1881dd58e2", "pubkey": "a7cab7643f544339c8f1f5fc646ccbffa1b9ab61846bad22b3348368a0bd2987", "created_at": 1677448654, "kind": 1, "tags": [ [ "e", "21bcc75bec18dd7d3d247f7ea97097dede214661962b2bc31eeb7fa75475cfa7" ], [ "p", "e5177ebf513530c2d0924083b64b7eadd7fb85efcc3e4dfb55c73a924c901ca7" ] ], "content": "What is a ordinal?", "sig": "40fd935c9c54b3b538d52e26e748120f724aa52e946ca803cdc3e1d69d8c87b4f2d4c342d79133077c9ddaa4964ff2f8252f2ef64b284eb18ca9dd9f6e91ee84" }