Abbreviations
- Id., Latin, short for idem, "the same", used in legal citations for the previously cited source
- Identification (disambiguation)
- Identity document, any document used to verify personal identity
- Dog tag, military and civilian neck-ID tags
- Identifier, name that identifies a unique object
- Independent Democrats, a political party in South Africa
- Industrial design
- Information design
- Interaction design
- Interior design
- Infectious disease
- Infectious dose
- Instructional design, the study of creating better online instructional experiences
- Intellectual disability
- Intelligent design, a modern form of the teleological argument for the existence of a god
- International dollar, common name for the Geary–Khamis dollar, a hypothetical unit of currency
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