The Clue Greek symbol of magnetic flux
The Answer PHI
The Greek symbol for magnetic flux is often represented by the letter "Φ," which is pronounced as "phi." In physics, magnetic flux is a measure of the quantity of magnetism, taking into account the strength and the area through which it passes. The use of Greek letters in scientific terms is common, and "phi" is one of the symbols used in this context. Therefore, "PHI" is the correct answer to the crossword clue.