Actually q.v. stands for the Latin phrase "quod vide." It is used to direct a reader to another part of a book or article for further information."
It stands for quality. Q, means Q-tip, because it is an easier short-form of the word. quilted
It means 5.
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It means the number 5 like v+7=12
"Q=Quenched & Tempered" steel used in decking materials that requires a higher load strength. I believe the term has been degraded to refer to the Robertson System of "Q"- Decking, but I could be...