# Differentiate between the two masses in equation for relativistic mass

how to differentiate between the two masses in equation for relativistic mass?
m= mo/sqroot 1-v^2/c^2 whats the difference between m and mo?

and what about for energy: eo and e?

The mass of the object at rest is $$m_0$$ ("m not", the zero usually signifies initial state). The other $$m$$ is the mass at the velocity you are traveling.