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$$mc^2.$$ is called an expression. Correct me if I'm wrong. I'd like to see this expression as $$m * c^2.$$ Here, one of the expression's factors is $m$. Is there a general name for the factors of an expression, or can I just call them however I like?

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$m$ is a multiplier and $c^2$ is a multiplicand, when you multiply them you get a product. Both $m$ and $c^2$ are factors of that product. –  glebovg Nov 6 '12 at 19:14
    
Multiples...? Of course, here m = mass (in kilograms), c=light's speed in meters by second., and thus the energy E is given in kg*m^2/s^2 , which is Joules. –  DonAntonio Nov 6 '12 at 19:20
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@DonAntonio I am not sure, but I think this question has nothing to do with physics. –  glebovg Nov 6 '12 at 19:22
    
If multiplication is all you are talking about, then the general name for factors in this sense is factors. –  rschwieb Nov 6 '12 at 20:11
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m is a multiplier of c^2 and c^2 is a multiplier of m. So generally speaking m and c^2 are multipliers, because its a product these two variables are called factors.

By expression I guess you mean the whole equation and not only c^2!

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You're right, thanks. I thought there might be a general name for it, but I'll stick with Factor. I'm developing a sort-of unit converter, so I wanted to name my classes correctly. :) –  timvermeulen Nov 6 '12 at 19:46
    
Like I said the number that comes first in a product is often called a multiplier and the second number is a multiplicand, but since multiplication is commutative (in this case), it does not matter so I guess you could simply call them factors. –  glebovg Nov 6 '12 at 21:22
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