Atichar (अतिचार) means a transgression or sin that goes beyond ordinary faults. In samvatsari pratikraman, Jains reflect and confess these gravest misdeeds committed in the past year (and, if relevant, over a lifetime) by body, speech, and mind, and seek forgiveness.

Key points:

• It is not just everyday mistakes; atichar refers to serious wrongdoings that harm others or violate strict Jain conduct.
• The confession includes thoughts, words, and actions that violated ahimsa (non-violence), truth, non-stealing, chastity, and non-possessiveness, as well as harsher or more deceptive acts.
• During samvatsari pratikraman, one recalls and repents for these sins, asks for forgiveness from all beings, and resolves to refrain from repeating them.
• There is a shared understanding across Digambar and Shwetambar traditions, though the exact wording or enumeration of sins may vary in ritual phrasing.

If you want, I can summarize a typical atichar list as it appears in your tradition, or provide the exact phrases used in Digambar vs. Shwetambar versions.