Mahabharata 1.61.10

अयःशिरा अश्वशिरा अयःशङ्कुश्च वीर्यवान्तथा गगनमूर्धा च वेगवांश्चात्र पञ्चमः

ayaḥśirā aśvaśirā ayaḥśaṅkuśca vīryavāntathā gaganamūrdhā ca vegavāṃścātra pañcamaḥ

Our plain-language meaning of this verse is waiting for scholar review.