- sarin, GB - a highly toxic chemical nerve agent that inhibits the activity of cholinesterase
--1 is a kind of organophosphate nerve agent
- gilbert, Gb, Gi - a unit of magnetomotive force equal to 0.7958 ampere-turns
--2 is a kind of magnetomotive force unit
- gigabyte, G, GB - a unit of information equal to one billion (1,073,741,824) bytes or 1024 megabytes
--3 is a kind of computer memory unit
--3 is a part of terabyte, T, TB
--3 has parts: megabyte, MB - United Kingdom, UK, Great Britain, GB, Britain, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland
--4 is a kind of kingdom
--4 is a part of British Isles
--4 is a member of
--4 has parts:European Union, EU, European Community, EC, European Economic Community, EEC, Common Market, Europe; North Atlantic Treaty Organization, NATO England; Northern Ireland; Scotland; Wales, Cymru, Cambria