Terminology
The "conservation contribution" (hozen kyōryoku-kin)
Conservation contribution, or donation, is an optional fee of 1000 yen (about 10USD) requested to hikers at one of major parking lots or trail heads, for which currently no practical benefit is given in return except for a small giveaway.
The "5th Station" (go-gōme)
The 5th Station originally indicated the halfway to the summit on a particular route, which has been developed as the base station for each major trail accessible by vehicles.