snr

signal-to-noise ratio

supernova remnant

Initialism of Single Number Rating, a measure of the efficacy of hearing protection.

Abbreviation of senior; a title used after a father's name when his son is given the same name.

His father, Barack Obama Snr, was a visiting foreign student at university in Hawaii where he met and married Ann Dunham, the corn-fed product of Kansas parents, who was also studying at the college.

Ricky Hatton's ex-coach Floyd Mayweather Snr believes it is inevitable the former world champion will be forced into making a ring comeback.