Sentence:  Note here, however, that the casino's "edge" (its expected value per unit bet, or, in casino jargon, the house p.c.) in table games is expressed as a percentage of the <WSD>handle</WSD> and not as a percentage of the drop (even though these might sometimes be the same). 
Meaning of the word marked with <WSD> tags:  The gross amount of wagering within a given period of time or for a given event at one of more establishments.