The item being recalled can be memory, when using it as remember, but there are other contexts as well. I was wondering if there is a more general word, perhaps utilizing the "recall" root.
The item being recalled is a recollection (despite its spelling that looks closer to collect that to recall.)
recollection (ˌrɛkəˈlɛkʃən) n
- the act of recalling something from memory; the ability to remember
- something remembered; a memory