diamond
n.— «First sergeants are required to be at least a master sergeant to wear a diamond on their sleeve, which is why they are sometimes referred to as “diamonds.” However, technical sergeants may be selected to hold the additional-duty first sergeant position, which involves many of the same responsibilities as a “diamond.”» —“‘Diamonds’ help raise Edwards’ bar” by Mike Young Edwards Air Force Base (California) Nov. 30, 2007. (source: Double-Tongued Dictionary)
Further reading
One secret to writing well is … there is no secret! There’s no substitute for simply sitting down day after day to practice the craft and learn from your mistakes. Plus, childhood mixups around word definitions can lead to some funny stories...
Knitters speak of being stranded on Sleeve Island. As the host of Sal & Al: The Woolslayers explains: Being on Sleeve Island is the feeling you get when you think you’re almost finished with a sweater because you’ve completed the...