bay in , ▁it ▁is ▁believed ▁to ▁have ▁come ▁from ▁the ▁K aw i ▁script ▁of ▁Java , ▁B ali ▁and ▁Sum atra , ▁which ▁in ▁turn , ▁desc ended ▁from ▁the ▁Pal lava ▁script , ▁one ▁of ▁the ▁southern ▁Indian ▁scripts ▁derived ▁from ▁Bra h mi . ▁ ▁Fe atures ▁Tag ban wa ▁is ▁a ▁sy ll ab ic ▁alphabet ▁in ▁which ▁each ▁con son ant ▁has ▁an ▁inher ent ▁v owel ▁/ a /. ▁Other ▁v ow els ▁are ▁indicated ▁by ▁a ▁dia crit ic ▁above ▁( for ▁/ i /) ▁or ▁below ▁( for ▁/ u /) ▁the ▁con son ant . ▁V ow els ▁at ▁the ▁beginning ▁of ▁sy ll ables ▁are ▁represented ▁by ▁their ▁own , ▁independent ▁characters . ▁Sy ll ables ▁ending ▁in ▁a ▁con son ant ▁are ▁written ▁without ▁the ▁final ▁con son ant . ▁ ▁Tag ban wa ▁is ▁tradition ally ▁written ▁on ▁b am bo o ▁in ▁vertical ▁columns ▁from ▁bottom ▁to ▁top ▁and ▁left ▁to ▁right . ▁Though ▁it ▁is ▁read ▁from ▁left ▁to ▁right ▁in ▁horizontal ▁lines . ▁ ▁V ow els ▁ ▁Cons on ants ▁ ▁Tag ban wa ▁writing ▁makes ▁use ▁of ▁single ▁() ▁and ▁double ▁() ▁pun ctu ation ▁marks . ▁ ▁Unicode ▁ ▁Tag ban wa ▁script ▁was ▁added ▁to ▁the ▁Unicode ▁Standard ▁in ▁March , ▁ 2 0 0 2 ▁with ▁the ▁release ▁of ▁version ▁ 3 . 2 . ▁ ▁The ▁Unicode ▁block ▁for ▁Tag ban wa ▁is ▁U + 1 7 6 0 – U