▁resol ving ▁the ▁given ▁tasks . ▁ ▁Om n id irection al ▁bar code ▁sc ann ers ▁ ▁Om n id irection al ▁sc anning ▁uses ▁" series ▁of ▁straight ▁or ▁cur ved ▁sc anning ▁lines ▁of ▁varying ▁directions ▁in ▁the ▁form ▁of ▁a ▁star bur st , ▁a ▁L iss aj ous ▁curve , ▁or ▁other ▁multi angle ▁arrangement ▁are ▁project ed ▁at ▁the ▁symbol ▁and ▁one ▁or ▁more ▁of ▁them ▁will ▁be ▁able ▁to ▁cross ▁all ▁of ▁the ▁symbol ' s ▁bars ▁and ▁spaces , ▁no ▁matter ▁what ▁the ▁orientation . ▁Al most ▁all ▁of ▁them ▁use ▁a ▁las er . ▁Un like ▁the ▁simpler ▁single - line ▁las er ▁sc ann ers , ▁they ▁produce ▁a ▁pattern ▁of ▁be ams ▁in ▁varying ▁orient ations ▁allowing ▁them ▁to ▁read ▁bar codes ▁presented ▁to ▁it ▁at ▁different ▁angles . ▁Most ▁of ▁them ▁use ▁a ▁single ▁rot ating ▁pol yg onal ▁mirror ▁and ▁an ▁arrangement ▁of ▁several ▁fixed ▁mirror s ▁to ▁generate ▁their ▁complex ▁scan ▁patterns . ▁ ▁Om n id irection al ▁sc ann ers ▁are ▁most ▁familiar ▁through ▁the ▁horizontal ▁sc ann ers ▁in ▁super mark ets , ▁where ▁packages ▁are ▁sl id ▁over ▁a ▁glass ▁or ▁sa pp hire ▁window . ▁There ▁are ▁a ▁range ▁of ▁different ▁om n id irection al ▁units ▁available ▁which ▁can ▁be ▁used ▁for ▁differ ing ▁sc anning ▁applications , ▁r anging ▁from ▁ret ail ▁type ▁applications ▁with ▁the ▁bar codes ▁read ▁only ▁a ▁few ▁cent imet res ▁away ▁from ▁the ▁sc anner ▁to ▁industrial