Erlangquan consists of 5 Sets of Duanquan (Short Boxing) and 8 sets of Changquan (Long Boxing).
Erlang Shen is a mythical god in Chinese Folklore, known for helping to regulate the great floods and as the nephew of the Jade Emperor. He carries a Trident Spear, a bow, and has a faithful Dog as a companion.
In a martial sense, Erlang also referred to two young gents, potraying that this skillset was originally only practiced as a 2 man combat set. Latter practitioners isolated the movements and developed the single set as well.
Erlangquan's 8 sections of Changquan are based on the Bagua (Trigrams) of Heaven, Lake, Fire, Thunder, Wind, Water, Moutain and Earth.