स्वमज्ञातिधनाख्यायाम्

Definition saṃjñā सर्वनामसंज्ञा

The word 'स्व', when used in a meaning different than 'relatives' and 'money' is optionally called सर्वनाम when followed by the जस् प्रत्यय.

Word by word (padaccheda)

Term / subject स्वम् prathamā · ekavacanaIn / when अज्ञाति- धनाख्यायाम् saptamī · ekavacana

Term / subject Prathamā (1st case): the term being defined, or the subject of the statement.
In / when Saptamī (7th case): "in X" or "when X", a domain or condition.

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Full reading

स्वम् अज्ञाति-धनाख्यायाम्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The word स्व 'own', when it does not mean a kinsman or property is optionally सर्वनाम before the affix जस्।
The word स्व when it does not mean a ज्ञाति 'kinsman' or धन 'property' or 'wealth' is always a sarvanama, in every number and case, as it has been enumerated among the pronominals, except in the nominative plural where it is optionally so. Thus स्वे पुत्त्राः or स्वाः पुत्राः 'one's own sons,' स्वे गावः or स्वा गावः 'one's own cows'.

But when it means 'kinsmen' or 'articles of property' स्वाः alone is the nom. pl. As, स्वा ज्ञातयो 'these kinsmen' प्रभूताः स्वाः 'much riches'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.