prastavanayas tu mukhe
nandi karyasubhavaha
asir-namaskriya-vastu-
nirdesanyatamanvita
astabhir dasabhir yukta
kimva dvadasabhih padaih
candranamaṅkita prayo
maṅgalartha-padojjvala
maṅgalam cakra-kamala-
cakora-kumudadikam
Similarly, in the Sixth Chapter of the Sahitya-darpana, text 282, he has said:
asir-vacana-samyukta
stutir yasmat prayujyate
deva-dvija-nr-padinam
tasman nanditi samjnita
The introductory portion of a drama, which is written to invoke good fortune, is called nandi-sloka.