Most cases are tried before District Courts (Bezirksgerichte, abbrev.: BG, singular: Bezirksgericht), with Regional Courts (Landesgerichte, abbrev.: LG, singular: Landesgericht) serving as courts of appeal and the Supreme Court (Oberster Gerichtshof, abbrev.: OGH) serving as the court of last resort. In cases considered particularly grave or technically involved, the Regional Courts serve as courts of first instance and specialized Regional Courts of Appeal (Oberlandesgerichte, abbrev.: OLG, singular: Oberlandesgericht) serve as courts of appeal, the Supreme Court still being the court of last resort.