A written abbreviation for 'extinguishing' or 'extinguisher' used in technical specifications, building codes, and emergency documentation.
Modern abbreviation created from the first four letters of 'extinguishing,' following standard abbreviation practices in technical writing. Became common in 20th-century safety and construction documentation.
You'll see 'extg' on building blueprints and fire safety plans as shorthand, but using it wrong once led to a hilarious incident where someone thought it meant 'exiting' instead of 'extinguishing'!
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