B- may refer to:
*B-, a
blood type
*
B- (grade)
This is a list of grading systems used by countries of the world, primarily within the fields of secondary education and university education, organized by continent with links to specifics in numerous entries.
Africa
Nigeria
The choice of gr ...
, an academic grade
*
B − L
In high-energy physics, ''B'' − ''L'' (pronounced "bee minus ell") is the difference between the baryon number (''B'') and the lepton number (''L'').
Details
This quantum number is the charge of a global/gauge U(1) symmetry in ...
, ('B minus L'), the difference between the baryon number (B) and the lepton number (L)
{{Disambiguation
