"Omen" - Ancient Hebrew "of" - means "sign," "signs.
"Omen" is a distinctive feature, characteristic, sign of certain actions, a conditioned sign of an event in history, denoting, revealing certain phenomena.
"Sign" is the designation of Divine manifestations, the actions of His Laws, revealed to man to determine his way of life in relation to God's Will, warning of his errors, mistakes that arise in his path of life.
"Signs" are the Truth of God's Word, expressed in His Commandments, which by their implementation determine key, momentous events in the life of man and in the history of nations.
"The "Sign" between God and man is the godly state of man who obeys His Commandments, which is also the most important, basic "sign" of the Kingdom in man of the Will of God.
"Signs" are the outward, visible manifestation by man of his inner prerequisite for the fulfillment of events with spiritual-image significance.
Negative Meaning.
"Omen" are the false predictions of the political and divination of the religious false prophets, the false teachings of the various pseudo-pastors of the nations.
"Omen" are also the various felt "Punishments" of God, i.e., the consequences of sinful, ungodly lifestyles, false worldviews, false political, religious, and philosophical views experienced by the nations.