«كَالزُّهْرِيِّ، عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنْ أَبِيهِ»
An example is al-Zuhri transmitting from Salim ibn ʿAbd Allah ibn ʿUmar, who transmits from his father, Ibn ʿUmar.
Chain outline:
ʿAbd Allah ibn ʿUmar → Salim ibn ʿAbd Allah → Muhammad ibn Muslim al-Zuhri.
Salim is a highly esteemed Successor narrating from his father, and al-Zuhri is a major early hadith scholar. Some scholars ranked this chain among the soundest asanid. Another celebrated chain is Malik from Nafiʿ from Ibn ʿUmar, but exact absolute rankings differ among scholars.
The purpose is to recognize a distinguished transmission line, not to pronounce every conceivable text attached to these names automatically sahih without further scrutiny.