Visperad or Visprad is either a particular Zoroastrian religious ceremony, or the name given to a passage collection within the greater Avesta compendium of texts. The Visperad ceremony "consists of the rituals of the Yasna, virtually unchanged, but with a liturgy extended by twenty-three supplementary sections." These supplementary sections (kardag) are then – from a philological perspective – the passages that make up the Visperad collection. The standard abbreviation for Visperad chapter-verse pointers is Vr., though Vsp. may also appear in older sources.