Sator,Arepo,Tenet,Opera
Numerology
S A T O R 73
A R E P O 55
T E N E T 64
O P E R A 55
R O T A S 73
Using numerology, one can assign the value 1 to the letter A, 2 to the letter B, and so on, up to 26 for the letter Z. Then, adding the values assigned to the letters in the rows and columns of the Sator square yields the following:Magical uses

The Sator Square is a four-times palindrome, and some people have attributed magical properties to it, considering it one of the broadest magical formulas in the occident. An article on the square from The Saint Louis Medical and Surgical Journal vol. 76, reports that palindromes were viewed as being immune to tampering by the devil,[clarify] hence their popularity in magical use.
The square has reportedly been used in folk magic for various purposes, including putting out fires, removing jinxes and fevers, to protect cattle from witchcraft and against fatigue when traveling. It is sometimes claimed it must be written upon a certain material, or else with a certain type of ink to achieve its magical effect.
Sator
'Sower', 'planter'
Arepo
Likely an invented proper name; its similarity with arrepo, from ad repo, 'I creep towards', is coincidental
Tenet
'he holds'
Opera
'works', '(cares)', 'efforts'
Rotas
'wheels'

Christian Associations
It is possible to write a horizontal and a vertical 'Pater Noster' with the letters of the sator square, forming a Greek cross. The two As and two Os which remain are then taken as Alpha and Omega. Another claim is that the words are a list of the "mystical names" for the nails pulled from Christ's body. The associations indicate the square may have been a safe, hidden way for early Christians to signal their presence to each other in a city without exposing themselves to persecution. A Sator Square uncovered in Manchester, England has been interpreted as early evidence for the arrival of Christianity in Britain.