Question

what does the term ICBN and ICZN indicates ? how are they useful to us ?

Answer 1

International code for botanical nomenclature (ICBN)
International code for Zoological nomenclature (ICZN)

Answer 2

ICBN:-(international code of botanical nomenclature)is the set of rules and recommendations dealing with the formal botanical names that are given to plants. 

ICZN:-(international code of zoological nomenclature) is a widely accepted convention in zoology that rules the formal scientific naming of organisms treated as animals. 

Hope dis helps u...