In high energy physics, B - L (pronounced "bee minus ell") is the difference between the baryon number (B) and the lepton number (L).

BL (or similar) may refer to:

• ECW Barely Legal, an ECW PPV
• BL Publishing, the publishing division of the wargames manufacturing, Games Workshop
• Bionicle Legends, a series of science-fiction novels based on Lego toys

The Bachelor of Laws (abbreviated LL. B., LL.B., LLB, or rarely, Ll.B.) is an undergraduate, or bachelor, degree in law (or a first professional degree in law, depending on jurisdiction) originating in England and offered in most common law countries as the primary law degree. In English-speaking Canada it is sometimes referred to as a post-graduate degree because previous university education is usually required for admission. The "LL." of the abbreviation for the degree is from the genitive plural legum (of lex, legis f., law), thus "LL.B." stands for Legum Baccalaureus in Latin.