That would have to be a nickname because angels are not human. They are spiritual created beings. A human angel would be a person who went around doing good to others. Being kind & helpful to those in need. Helping someone out financially. A person that is so kind that people say " they are just an angel ".
I do not believe angels are human. I do believe some people have angels that watch over them. I also believe that some angels help some people help others....I do not quite understand this in a way I can put into words on here, sorry. I know I have a guardian angel....I do not know if she is with me all the time or if she watches over others as well....I have a lot of thoughts and questions on this and slowly I find the answers.