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Per the creator of BIP47 (Justus Ranvier), it's RFC2014 notation:
https://en.wikipedia.org/wiki/Hash-based_message_authentication_code#Definition_.28from_RFC_2104.29
https://tools.ietf.org/html/rfc2104https://www.rfc-editor.org/rfc/rfc2104
https://tools.ietf.org/html/rfc2104
https://www.rfc-editor.org/rfc/rfc2104