Hang is an ambiregular verb with an unusual usage note.
It has the 3rd person form "hangs", and the -ing form "hanging". Hang has the regular preterite and past participle "hanged" - but also has an irregular preterite and past participle "hung". As a method of execution, especially in formal and legal English, the "hanged" form is preferred over "hung", but otherwise "hung" is preferred. This use however is somewhat inconsistently applied in real life. And since, at least in English-speaking countries don't hang people any more, this distinction is likely to break down further.