Universal rules of nomenclature are as follows:
a. Biological names are generally in Latin and written in italics.
b. The first word in biological name represents the genus. The second component denotes the specific epithet.
c. Both the words in a biological name, when hand written are separately underlined, or printed in italics to indicate their Latin origin.
d. The first word denoting genus starts with a capital letter while the specific epithet starts with a small letter.
Example: Mango - Mangifera indica.