from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Denoting
excitement, surprise, or shock.
- noun chess Indicates a good move.
- noun botany Placed after a
herbariumabbreviation to indicate that the mentioned materialheld there has been examined directly by the author.
- noun computing A
Boolean negation, the not operator, serving to invertthe truth valueof what follows.
- noun computing Formerly used as a
separatorbetween hostnamesin an e-mail addressfor the purpose of routinga message (called bang path notation).
- noun computing, IRC Used as a separator between a user's
- noun mathematics
from Wiktionary, Creative Commons Attribution/Share-Alike License
May derive from a Latin Io, with the I written over the o, placed at the end of an exclamation to mark it as such. The Io may either be an abbreviation for interiectiō ("interjection"), or else the interjection Iō ("hey!").
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