Vaisesika Sūtra 2.1.18

संज्ञा कर्म त्वस्मद्विशिष्टानां लिङ्गम् ॥१८॥

saṁjñā karma tvasmadviśiṣṭānāṁ liṅgam ॥18॥

[संज्ञा कर्म तु अस्मत् विशिष्टानां लिङ्गम्॥
saṁjñā = name; karma = action; tu = indeed; asmat = are its; viśiṣṭānāṁ = bring out particularity; liṅgam = is the distinguishing mark;॥]

Indeed, Name and Action are its distinguishing marks that bring out particularity.