B or b (pronounced , ) is the 2nd letter in the ISO basic Latin alphabet. It represents the voiced bilabial stop in many languages, including English. In some other languages, it is used to represent other bilabial consonants.

\b is used in computing to represent

• Backspace, e.g. in C
• Word boundary in regular expressions

B is the second letter of the Latin alphabet.

In computer science, B* (pronounced "B star") is a best-first graph search algorithm that finds the least-cost path from a given initial node to any goal node (out of one or more possible goals). First published by Hans Berliner in 1979, it is related to the A* search algorithm.

B+ may refer to:

• B+, a blood type
• B+ (grade), an academic grade
• B+ tree, a data structure
• BBC Micro model B+, a British home computer
• Raspberry Pi model B+, a British single-board computer
• The plus voltage of a Battery (electricity) or plus voltage of an electronic circuit

B- may refer to:

• B-, a blood type
• B- (grade), an academic grade
• B-L, (pronounced "bee minus ell") is the difference between the baryon number (B) and the lepton number (L)

BE-AT.TV is an online global community connecting clubbers and electronic music fans with big-name DJs, venues and festivals.

Bitch, literally meaning a female dog, is a slang for a person, commonly a woman, who is belligerent, unreasonable, malicious, a control freak, rudely intrusive or aggressive. When applied to a man, bitch is a derogatory term for a subordinate. Its original use as a vulgarism, documented to the fourteenth century, suggested high sexual desire in a woman, comparable to a dog in heat. The range of meanings has expanded in modern usage. In a feminist context, it can indicate a strong or assertive woman.

In the mathematical field of complex analysis, the Bloch space, named after André Bloch and denoted or B, is the space of holomorphic functions f defined on the open unit disc D in the complex plane, such that the function

A blood type (also called a blood group) is a classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. Some of these antigens are also present on the surface of other types of cells of various tissues. Several of these red blood cell surface antigens can stem from one allele (or an alternative version of a gene) and collectively form a blood group system. Blood types are inherited and represent contributions from both parents. A total of 35 human blood group systems are now recognized by the International Society of Blood Transfusion (ISBT). The two most important ones are ABO and the RhD antigen; they determine someone's blood type (A, B, AB and O, with +, - or Null denoting RhD status).

An emoticon ( or ), etymologically a portmanteau of emotion and icon, is a metacommunicative pictorial representation of a facial expression that, in the absence of body language and prosody, serves to draw a receiver's attention to the tenor or temper of a sender's nominal non-verbal communication, changing and improving its interpretation. It expresses — usually by means of punctuation marks (though it can include numbers and letters) — a person's feelings or mood, though as emoticons have become more popular, some devices have provided stylized pictures that do not use punctuation.