In electrophysiological convention, a positive current value or upward deflection of the current trace is typically referred to as an outward current. A positive current value (i.e., outward current) can reflect either the movement of positive ions (cations) out of the cell or negative ions (anions) into the cell.

Inward current

Neuronal Action Potential - Pharmacological Inhibition of Na⁺ and K⁺ Channels