nines
n.— «What level of reliability do you want to design into the satellite, and verify via ground testing? 99%? Or three nines? Or four?» —“Re: German conference highlights doubts about ESA’s manned space plans” by Kieran A. Carroll Usenet: sci.space Mar. 12, 1991. (source: Double-Tongued Dictionary)
Further reading
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...
An anadrome is a word that forms a whole new word when you spell it backwards. For example, the word “stressed” spelled backwards is “desserts.” Some people’s first names are anadromes. There’s the girl named Noel...