وَحُرُوفُ النِّدَاءِ خَمْسَةٌ: «يَا» وَ«أَيَا» وَ«هَيَا» وَ«أَيْ» وَالْهَمْزَةُ الْمَفْتُوحَةُ.
Translation: The five particles are yā, ayā, hayā, ay, and an open-hamza vocative (a-).
This is the complete list of five. The text does not here detail their rhetorical distribution.