Here are Drunvalo Melchizedek's list of triple numbers and their meanings from page 88 & 89 of his book, 'The Serpent of Light,Beyond 2012':
111 - Energy Flow: Any energy flow such as electricity,money,water, sexual energy, etc.
222 - New Cycle: The beginning of a new cycle, the nature of which depends on the next triple number you see.
333 - Decision: You have a decision to make. The decision will lead to either 666, which means you must repeat the lesson again in some other way, or it will lead to 999, which is completion and you have learned the lesson.
444 - The Mystery School: What is occurring in life is a lesson around learning about the Reality. This school is learning, such as reading books or studying a subject, but not actual doing.
555 - Unity Consciousness: This is the number when someone has attained Unity Consciousness. They have mastered all levels of the Mystery School. It is the highest number. It is the number of Christ.
666 - Earth Consciousness: This is the number of the Beast in the Bible, so it can represent pure evil, but it is also the number of mankind and life. Carbon is the basis of life, and carbon has six protons, six neutrons, and six electrons. Generally, when you see this number, it means to watch out for physical events that are presenting themselves at that moment, and you must be careful.
777 - The Mystery School: This is the part of the school where you are not just reading books about life, but are also practicing it.
888 - Completion of a particular lesson within the Mystery School.
999 - Completion of a particular cycle of events.
000 - Has no value.
He further states 'Long ago, the Angels taught me that when you see a triple number in the Reality, it has significance relative to what you are thinking or the environment around you. It has to do with music and the fact that all notes in an octave separate themselves by eleven cycles per second. Therefore, the separations of each note to each other are 11, 22, 33, 44, 55. 66, 77, 88, and 99 cycles per second, or multiples of these numbers, which presents a perfectly harmonic tuning or moment in time, since the entire Reality was created through the harmonics of music.
Therefore, when triple numbers or more appear, in any manner, it physically represents a mathematical moment in time that contains the harmonics of the value of that number. In human words, 444 would best be described as the Mystery School, which is where one learns about the Reality.'