BA

Bus Adapter

BAF

Biological Air Filter

BAM

Bone Analysis Module

BAR

Browsing, Analysis and Reporting system

BAT

Battery

BB

Broad Band/Bread-Board

BBM

Bread-Board Model

BC

Basic Cover
Basic Coverage
Bit Conditioner

BCE

Battery Control Electronic

BCF

Black Command File

BCPKT

Broadcast Packet

BCR

Battery Charge Regulator

BD

Bypass Data

BDC

Baseline Data Collection

BDR

Battery Discharge Regulator

BEE

Best Engineering Estimate

BEP

Back End Processor

BER

Burst Excess Rate
Bit Error Rate

BERT

Bit Error Rate Tests

BET-method

Brunauer, Emmet and Teller-method (for surface-area characterization)

BGB

BioGloveBox

BGP

Border Gateway Protocol

BGO

Bismuth Germanate Oxide

BI

Business Intelligence applications

bin

Binary

BioLab

Biological Laboratory (multi-user facility)

BIS

British Interplanetary Society

BITE

Built-In Test Equipment

Bits/s

Bits per second

BIV

VEGA Integration Building

BK

Back - Up

BLK

Block

BM

Breadboard Model

BMD

Battery Mode Detector Status (Signal)

BMP

Image file name extension, Bitmap

BMTC

Biotechnology Mammalian Tissue Culture facility

BNC

Bayonet N-Connector (Standard Coaxial Connector)

BNSC

British National Space Centre

BO

Business Objects

BOL

Beginning of Life

BOM

Beginning of Mission

BOT

Beginning of Tape

BP

Broadcast Packet

BPF

Band-Pass Filter

BPR

Budget Preparation and Revision

bps

bits per second

BPSK

Binary Phase Shift Keying

bR

Bacteriorhodopsin

BRAT

Bit-Rate-Allocation Table

BRI 

Basic-Rate Interface

BRIC

Countries Brazil, Russia, India, China

BSSC

Board for Software Standardisation and Control

BSI

British Standards Institute

BSLD

Baseline Service-Level Definition

BSM

Belgian Soyuz Mission

BT

British Telecom

BTW

By The Way

BW

Black and White