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Si
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Si, si, or SI may refer to (all SI unless otherwise stated):
In language:
- ISO 639 alpha-2 code for the Sinhalese language
In computer science:
- .si, the Internet country code top-level domain for Slovenia
- Shift In, a control code in the C0 control code set
- Swarm Intelligence, an artificial intelligence technique
- Synthetic Intelligence, a form of artificial intelligence
In education:
- Saint Ignatius College Prepatory, a Jesuit college in the United States
- Samahang Ilokano, a fraternity/sorority based in the Philippines
- Seletar Institute, a defunct centralised institute in Singapore
- Silay Institute, Inc., a private college in the Philippines
- Smithsonian Institution, an American educational and research institute
In gaming:
In mathematics and science:
- Signal integrity, electronic circuit tools and techniques that ensure electrical signals are of sufficient quality for proper operation
- Si, the chemical symbol for silicon
- Si(x), the sinc function in mathematics
- Si, the sine integral in mathematics
- Survey of India, an Indian government agency responsible for managing geographical information about India
- International System of Units (Système International d'Unités), the modern international standard version of the metric system
- Simple Interest (Mathematics)
In medicine:
- Sacroiliac
- Self-injury
- Sensory integration, the neurological process that organizes sensation from one's own body and the environment
- Upper often referring to Primary somatosensory cortex
- Sexual intercourse, a medical abbreviation
- Suicidal ideation, a medical term for thoughts about suicide
- Sacroiliac, an anatomical abbreviation for the sacroiliac (joint)
In music:
- Si, the original name of the seventh note of solfege, later changed to "Ti"
- Sì (song), the name of the Italian entry to the Eurovision Song Contest 1974
- Sí (Julieta Venegas), an album by Mexican singer and songwriter Julieta Venegas
- Si, another name for the Sídhe, Celtic mythological beings
In government and politics:
In sports:
In transportation:
Other:
See also
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