बाह्वन्तात् संज्ञायाम्

Operational rule vidhi

The feminine affix ऊङ् comes in denoting a Name after a प्रातिपदिक (Nominal Stem) ending with the word बाहु.

Word by word (padaccheda)

Left context बाह्व- अन्तात् pañcamī · ekavacanaRight context संज्ञायाम् saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

बाह्व-अन्तात् संज्ञायाम्

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

Commentary

The feminine affix ऊङ् comes in denoting a Name after a प्रातिपदिक (Nominal Stem) ending with the word बाहु।
Thus भद्रबाहूः 'Bhadrabahu'; जालबाहूः &c. Why do we say in "expressing a Name"? Observe वृत्तबाहूः 'a woman having rounded hand' which is an attributive word. In other words, when the compound is a name, बाहु takes long ऊ in the feminine.

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