'B.Sc.' originates from modern English, specifically the phrase 'Bachelor of Science', where 'Bachelor' comes from the English word 'bachelor' (originally indicating a young man or novice) and 'Science' comes from English 'science' (systematic knowledge).

'Bachelor' changed from Old French word 'bacheler' ( Medieval Latin influenced) and eventually became the modern English word 'bachelor'; 'science' came from Latin 'scientia' via Old French and Middle English to become modern English 'science'.

Initially, 'bachelor' could mean 'young man' or 'young knight' and 'science' broadly meant 'knowledge'; over time 'bachelor' came to be used for the holder of a first university degree and 'science' narrowed to fields of systematic study, producing the compound meaning now expressed by 'Bachelor of Science'.