Periodic yield
From ACT Wiki
A rate of return - or cost of borrowing - expressed as the proportion by which the amount at the end of the period exceeds the amount at the start.
Example
GBP 1 million is borrowed.
GBP 1.03 million is repayable at the end of the period.
The periodic yield (r) is:
(End amount / start amount) - 1
= (1.03 / 1) - 1
= 0.03
= 3%