In Jainism, “chauvisi” (चौबीसी) means a group of 24 Tirthankars.

So:

1. Pichhli Chauvisi (पिछली चौबीसी)

• “Pichhli” = previous / earlier.
• Pichhli chauvisi means the earlier set of 24 Tirthankars who existed before the present 24 in this time‑cycle.
• They also gave the same Jain dharma – ahimsa, samyak darshan, samyak gyan, samyak charitra – but in an earlier period of the world cycle.

2. Aavti Chauvisi (आवती चौबीसी)

• “Aavti / Aavti” is used for the current or ‘coming/last’ set.
• Aavti chauvisi means our present group of 24 Tirthankars in this avasarpini:

- starting from Bhagwan Rishabhdev (Adinath) - and ending with Bhagwan Mahavir Swami.

• When people say “Aavti chauvisi ke Tirthankar,” they usually mean these 24 from Rishabhdev to Mahavir.

In simple words:

• Pichhli chauvisi = the previous 24 Tirthankars (earlier time).
• Aavti chauvisi = the present 24 Tirthankars (Rishabhdev to Mahavir) in this current world‑cycle.