At the money
From ACT Wiki
(ATM).
1.
An option is at the money when immediate exercise of the option would result in neither a gain nor a loss. This is when the underlying asset price is equal to the strike price of the option.
2.
A derivative such as a swap is at the money when, for example, the swap rate is equal to the relevant current market rate, so that the net present value of the derivative is Nil.
