An “of” phrase in English is a phrase in which two nouns are joined by the word “of”:
The technical word for this kind of construction is a genitive construction.
Notice that in English, some “of” phrases can also be expressed by adding -’s to the noun that follows “of”:
The same relationship can be expressed by a “possessive pronoun,” such as “his,” “your,” “my,” or “our.” This is also a genitive construction, even though it is not signalled by “of.”
English uses many “of” phrases, and other genitive constructions; Greek, the original language of the Divine Services, uses the genitive construction even more than English does.