▁are ▁named ▁for ▁their ▁positions . ▁The ▁bottom ▁rail ▁is ▁also ▁known ▁as ▁" k ick ▁rail ". ▁A ▁middle ▁rail ▁at ▁the ▁height ▁of ▁the ▁b olt ▁is ▁known ▁as ▁the ▁" lock ▁rail ", ▁other ▁middle ▁rails ▁are ▁commonly ▁known ▁as ▁" cross ▁rails ". ▁ ▁M ull ions ▁– ▁Sm aller ▁optional ▁vertical ▁bo ards ▁that ▁run ▁between ▁two ▁rails , ▁and ▁split ▁the ▁door ▁into ▁two ▁or ▁more ▁columns ▁of ▁pan els , ▁the ▁term ▁is ▁used ▁sometimes ▁for ▁vertical s ▁in ▁doors , ▁but ▁more ▁often ▁( UK ▁and ▁Australia ) ▁it ▁refers ▁to ▁vertical s ▁in ▁windows . ▁ ▁M unt in ▁– ▁Optional ▁vertical ▁members ▁that ▁divide ▁the ▁door ▁into ▁smaller ▁pan els . ▁ ▁Pan els ▁– ▁Lar ge , ▁wider ▁bo ards ▁used ▁to ▁fill ▁the ▁space ▁between ▁the ▁st iles , ▁rails , ▁and ▁m ull ions . ▁The ▁pan els ▁typically ▁fit ▁into ▁gro ov es ▁in ▁the ▁other ▁pieces , ▁and ▁help ▁to ▁keep ▁the ▁door ▁rig id . ▁Pan els ▁may ▁be ▁flat , ▁or ▁in ▁raised ▁panel ▁designs . ▁Can ▁be ▁gl ued ▁in ▁or ▁stay ▁as ▁a ▁floating ▁panel . ▁ ▁Light ▁– ▁a ▁piece ▁of ▁glass ▁used ▁in ▁place ▁of ▁a ▁panel , ▁essentially ▁giving ▁the ▁door ▁a ▁window . ▁ ▁Board ▁b atten ▁doors ▁ ▁Also ▁known ▁as ▁led ges ▁and ▁b rac ed , ▁Board ▁and ▁b atten ▁doors ▁are ▁an ▁older ▁design ▁consisting ▁primarily ▁of ▁vertical ▁sl ats : ▁ ▁Pl anks ▁– ▁Bo