▁Arena ▁ ▁Dragon F able , ▁a ▁ 2 0 0 6 ▁video ▁game ▁by ▁Art ix ▁Entertainment ▁ ▁D war f ▁Fort ress , ▁a ▁ 2 0 0 6 ▁sand box - style ▁computer ▁game ▁ ▁Places ▁ ▁Dist rito ▁federal , ▁or ▁federal ▁district , ▁in ▁multiple ▁countries : ▁ ▁Federal ▁District ▁( B raz il ) ▁ ▁former ▁Federal ▁District ▁( M ex ico ), ▁now ▁Mexico ▁City ▁ ▁Polit ics ▁ ▁Dan ish ▁People ' s ▁Party ▁( D ansk ▁Fol ke part i ) ▁ ▁Democratic ▁Front ▁( Mont en eg ro ) ▁( D em okrat ski ▁front ) ▁ ▁Science ▁and ▁technology ▁ ▁df ▁( Un ix ), ▁a ▁Unix ▁command ▁to ▁report ▁disk ▁space ▁usage ▁by ▁a ▁filesystem ▁ ▁D air y ▁free , ▁ident ifying ▁products ▁that ▁contain ▁no ▁milk ▁ ▁Dec ap ac itation ▁factor , ▁in ▁bio chem istry ▁ ▁D eg rees ▁of ▁freedom , ▁various ▁measures ▁in ▁mathematics ▁and ▁physics ▁ ▁D ens ity ▁function , ▁a ▁mathematical ▁function ▁with ▁a ▁wide ▁range ▁of ▁applications ▁ ▁Die lect ric ▁loss ▁ ▁D irection ▁finding , ▁a ▁technique ▁used ▁to ▁locate ▁radio ▁transmit ters ▁ ▁D irection ▁flag , ▁a ▁flag ▁stored ▁in ▁the ▁F LA GS ▁register ▁on ▁all ▁x 8 6 - compatible ▁CPU s ▁ ▁D iss ip ation ▁factor , ▁a ▁measure ▁of ▁loss - rate ▁of ▁energy ▁of ▁an ▁oscill ation ▁mode ▁in ▁a ▁diss ip ative ▁system ▁ ▁D ong f eng ▁( miss