Snr is the written abbreviation for Senior . It is used after someone’s name to distinguish them from a younger member of their family who has the same name. ( mainly BRIT; in AM, use Sr. )
...Robert Trent Jones, Snr.
SNR
Meaning of SNR in English
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006