# What does the . in equations stand for?

What does the "." in equations stand for?

I've been revising electric fields, and have come across the equation $$\Delta E_{p} = k . Q_{1} Q_{2} [ \frac{1}{r_{1}} - \frac{1}{r_{2}}]$$

I have never come accross a decimal point in an equation before, what does it mean?

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rock.freak667
Homework Helper
"." is another way of saying "multiplied by"

Air
It is to avoid using $\times$ which can be used to represent a variable. It would cause confusion hence a dot is used to show multiplication.

chroot
Staff Emeritus