SII may be an acronym of:
- Smith International Inc. - NYSE ticker symbol SII
- Secondary sensory cortex
- Strong Interest Inventory
- Seiko Instruments Inc.
- Silicon Image Inc.
- Securities & Investment Institute, a London-based professional and training body
- Studio Innovators International
- Speech Intelligibility Index, a way to measure the understandability of speech for a listener in different conditions (noise, hearing loss, etc.), similar to the Articulation Index (AI).
Sii may refer to:
- Sii, the front legs of a dragon in E. E. Knight's Age of Fire series
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