APO Hiking Society and hero, Apolinario Mabini, and later shortened to "Apo", an Ilocano term for a wise man or a Tagalog term of grandchildren, and later re-branded to "APO" (all caps). Contrary to popular belief, the "Apo" name was not a reference to the Philippines's highest peak, the potentially-active stratovolcano Mount Apo. As the students advanced into college, Danny Javier joined the group. After graduation, the majority of its members left to pursue individual careers, with only three members remaining, made up of Jim Paredes, Boboy Garovillo and Danny Javier. In the span of their professional career, Apo emerged as a principal
Lake Apo in the mountains who assaulted his granddaughter and was punished by the mountain deities for his disrespectful act by flooding the area forming the Lake Apo. The lake is a crater lake, a basin formed on an old volcanic cone that was later filled with water. It was erroneously reported as a circular rift lake, as this area is not a rift zone but a volcanic area evident by the presence of nearby volcanic peaks like Musuan Peak ( to the E), Mount Kalatungan ( to the NW), Mount Dagumbaan ( to the SW), Mount Kidongin ( to the SW),