What does GB stands for?

Answer 1

It can mean lots of things. For example:

In medicine:

• Gastric bypass surgery, a class of medical procedures used to treat morbid obesity
• Group B streptococcus, a type of bacteria which causes a Group B streptococcal infection
• Guillain-Barré syndrome, an autoimmune disease affecting the peripheral nervous system
• Glasgow-Blatchford bleeding score, a screening tool for patients with acute upper gastrointestinal bleeding
• Gay bowel syndrome, an obsolete term that was sometimes used to refer to conditions supposedly more frequent in gay men

In education:

• God's Bible School and College, a Christian college in Cincinnati, Ohio, United States
• Gandaki Boarding School, formerly called Nepal Adarsha Vidyashram, a boarding school in Nepal
• Galgotias Business School, a management school in Greater Noida, India
• Glenbrook South High School, a high school in Glenview, Illinois, United States
• Gyeonggibuk Science High School, a science high school in Uijeongbu, Republic of Korea
• Goethe Business School, a graduate business school in Frankfurt am Main, Germany

In technology:

• Gravity-based structure, a support structure technique often used in building offshore oil platforms
• Global Broadcast Service, a United States Military communications network
• Game Boy Sound System, the audio playback technology used in the Nintendo Game Boy
• GNU build system, also known as Autotools, a suite of GNU project programming tools
• GBs, plural of gigabyte
• Gbs, short for gigabits per second, a data rate unit
• Grundy Business Systems, an English microcomputer company of the 1980s
• Global Business Services, a division of IBM Global Services

Other:

• The Gay Byrne Show, an Irish radio show (1974-1998)
• The IOC country code for Guinea-Bissau
• Gifu Broadcasting System, a television and radio station in Gifu Prefecture, Japan
• Gold Bauhinia Star, the second highest rank in the Hong Kong honours system
• Great Big Sea, a Canadian folk-rock band
• George Bernard Shaw (1856-1950), an Irish playwright
• Gram Bharati Samiti, or Society for Rural Development, a non-governmental organization in the Jaipur district of Rajasthan
• Große Berliner Straßenbahn, a former name of the Berlin Straßenbahn
• Gürbetal-Bern-Schwarzenburg-Bahn, a former Swiss railway, now part of the Bern-Lötschberg-Simplon railway
• Guillermo Barros Schelotto, an Argentine soccer player
• Gugun Blues Shelter, Indonesian music group

Hope That helps. ;)

Answer 2

Great Britain or Gigabyte depending on what you're talking about Also, Game Boy, a handheld console from Nintendo.
A GB is a gigabyte. It's 109 bytes.