The word 'Magic' and 'Magician' comes from the demonic.
The majority of professional magicians use demons to do their tricks (approx. 95%). I could name the magicians, but at this time I won't as I could become liable for deformation of character. The majority of magicians that use demons deliberately will end up in hell.
Numerology is any belief in the divine, mystical relationship between a number and one or more coinciding events. It is also the study of the numerical value of the letters in words, names and ideas. It is always associated with the paranormal and astrology. Pythagoras believed that because mathematical concepts were more 'practical' than physical ones they had greater actuality.
Symbolism is the study of culture symbols and they can be interpreted to better understand a particular society.
MATHEMATICS (from Greek "knowledge, study, learning")
Mathematics is the study of topics such as quantity (numbers), structure, space and change.
The study of space originates with geometry, in particular, Euclidean geometry, which combines space and numbers, and encompasses the well known Pythagorean Theorem.
A spell is a set of spoken words that is considered by its user to envoke evil effects (there has of course have to be intent with the words to do evil).