The phrase "person occupancy" means how many people can be in a specific place at a given time. It refers to the maximum number of individuals allowed in a certain area for safety or legal reasons. Full definition
If the number of individuals occupying a room decreases, the remaining travelers will be responsible for additional costs incurred as a result of a change in the per person occupancy rate. (southwestvacations.com)
Single person occupancy, no sparkling wine, no truffles, no breakfast. (donapa.com)
An additional two person occupancy charge is required with this guest room. (thespringscostarica.com)