The Leo may be Ped which just means to hold the pedal. Perhaps if there is a little star thing that appears shortley after the Leo sign (it also looks like the BP logo) Then it definately is the Pedal marking.
FUNCTIONAL CAPACITY. Functional capacity refers to the capability of performing tasks and activities that people find necessary or desirable in their lives. One way of examining the effects of disease on people and communities is through mortality and morbidity (illness) statistics. But another way, which took on increased significance in the last decades of the twentieth century, is through examining functional status or functional capacity.
The functional residual capacity (FRC) includes the expiratory reserve volume and the residual volume. The FRC measures the amount of additional air that can be exhaled after a normal exhalation. The total lung capacity (TLC) is a measurement of the total amount of air that the lung can hold. It is the sum of the residual volume, expiratory reserve volume, tidal volume, and inspiratory reserve volume..