Explanation:

Prayag-Prashasti: Prayag-Prashasti is the name given to the Allahabad Pillar. “Prayag” means a meeting place for something or someone. Prayag is an ancient name of Allahabad as it is the meeting place or ‘Sangam’ of rivers Ganga, Yamuna and the mythical Saraswati. Prashasti means “in praise of someone” and is a eulogy. The Allahabad Prasasti was originally engraved on the Ashokan Pillar in Kausambhi near Allahabad. Later it was removed to the Allahabad fort. The usual Ashokan inscriptions in Brahmi script as in all pillars.
Rummindei Pillar Edicts (Lumbini): These inscriptions come under the Minor Pillar Inscriptions. These contain inscriptions recording their dedication. The inscriptions mentions Ashoka’s visit to Lumbini (Rummindei), Rupandehi district, Nepal, the birthplace of Lord Buddha. Ashoka exempted Lumbini from paying tax, and fixed its contribution of grain at one – eighth. The inscriptions are written in Brahmi script.
Mehrauli Inscription: The Mehrauli Iron Pillar is located in Delhi in the Qutub Minar complex. It is notable for the rustresistant composition of the metals used in its construction. This pillar was established by Chandragupta-II of Gupta dynasty as Vishnupada in the honor of Lord Vishnu. This pillar credits Chandragupta with conquest of the Vanga Countries by his battling alone against the confederacy of the enemies united against him. It also credits him for conquest of Vakatakas in a fight that ran across seven mouths of Indus River.