Nomenclature is just a system of naming. In science, they use Binomial Nomenclature, two-names. Ex, Decaisnea Fargesii is two-named; it represents a plant also know as Dead Man's Fingers.
The binomial nomenclature for a rhino is "Rhinoceros" for the genus and the specific species name, such as "Rhinoceros unicornis" for the Indian rhinoceros or "Rhinoceros sondaicus" for the Javan rhinoceros.
He developed the system known as binomial nomencalture.
Its basically saying that it is a 2 way naming system bi means #2 in Latin and nomial is name so 2 name i.e genus and species
The ratio is called the chemical formula. Naming these compounds is called nomencalture. Example: NaCl sodium (Na) has a +1 charge and chlorine (Cl) has a -1 charge the charges cancel out and therefore the ratio is one to one Another Example: MgCl2 magnesium (Mg) has a charge of +2 and chlorine (Cl) has a charge of -1. It takes two chlorines to cancel out one magnesium so the ratio is one to two.
The term undergraduate degree is generally used for completing a 4 year Bachelors of Science or Arts program. A Masters degree is achieved after completing a, generally 2 year, additional program past that and can be called a graduate degree. Generally, these are a Master of Science or Arts. (So all Masters are a graduate degree, but not all graduate degrees are a Masters. Some fields may use a different nomencalture for the post baccurlate programs). A Doctorate, which takes approx. 7 years more, identifes someone completing a program generally including writing/supporting a thesis/disertation ( a large research paper of intellectual interest) above those other degrees.