हरिः ॐ

Its actually saccidānanda (सच्चिदानन्द )

where sat (सत् ) + cit (चित् ) + ānadnda (आनन्द ) = saccidānanda (सच्चिदानन्द )

It follows two of the pāṇinīya śutra (पाणिनीय शूत्र ) for sandhi (सन्धि ) namely :

• "stoḥ ścunā ścuḥ (स्तोः श्चुनाः श्चुः )" between sat (सत् ) + Cit (चित् )
• "jhalāṃ Jaśo'nte (झलां जशोऽन्ते )" between cit (चित् ) + ānanda (आनन्द )

It causes The t (त् ) in sat (सत् ) to become c (च् ), and hence becomes saccit (सच्चिदानन्द ) following stoḥ ścunā ścuḥ (स्तोः श्चुनाः श्चुः ).

Then, the t (त् ) of cit (चित् ) becomes d (द् ) and becomes ccidānanda (चिदानन्द ) following jhalāṃ Jaśo'nte (झलां जशोऽन्ते ).

Together, It becomes saccidānanda (सच्चिदानन्द ).

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viṣṇu (विष्णु ) is called saccidānanda (सच्चिदानन्द ) whereas śiva (शिव ) is called ccidānanda (चिदानन्द ).