‘Of’ means whole

Of: The word "of" is a preposition. It is a word of different meanings, and susceptible of numerous different connotations. It may be used in its possessive sense to denote possession or ownership. It may also be used as a word of identification and relation, rather than as a word of proprietorship or possession. "Of" may denote source, origin, existence, descent, or location, or it may denote that from which something issues, proceeds, or is derived. The term may indicate the aggregate or whole of which the limited word or words denote a part, or of which a part is referred to, thought of, affected, etc.