What does QDV stand for?

What does QDV mean?

QDV	Are you flying in a horizontal visibility of less than ...? Governmental » Transportation
QDV	Are you flying in a horizontal visibility of less than ...? Governmental » Military
QDV	Bitmap graphics (8bit) (Random Dot QDV file) Computing » File Extensions
QDV	Quark Xpress Dictionary File Computing » File Extensions
QDV	Quick Dump Valve Miscellaneous » Unclassified
QDV	Quick- Disconnect Valve Miscellaneous » Unclassified