SG

SG is a common abbreviation used in different contexts to denote several, unrelated ideas. The meaning of SG depends on the field or region in which it appears.

In geography and national identifiers, SG is notably the ISO 3166-1 alpha-2 country code for Singapore. It is used in international codes, travel documentation, and logistics. Singapore also uses the internet country code top-level domain .sg and is represented by the international vehicle registration code SG in some contexts.

In science and engineering, SG most often stands for specific gravity, a dimensionless measure defined as the ratio of a substance’s density to that of water at a specified temperature (commonly 4°C). Specific gravity helps compare materials in geology, mineralogy, chemistry, and process engineering.

In electronics and instrumentation, SG can refer to a signal generator—an instrument that produces electrical signals for testing and measurement. Signal generators are used in laboratories, radio and communications work, and electronic manufacturing, sometimes abbreviated as SG in catalogs or schematics.

In education and student life, SG commonly stands for student government, a body elected to represent the student body, advocate for student interests, and coordinate events and activities within a school or university.

Because SG is an abbreviation with multiple legitimate meanings, its intended interpretation is determined by context. Other uses may exist in specialized organizations, publications, or regional conventions.