something visible that by association or convention represents something else that is invisible | a whole individual unit; especially when included in a list or collection |
an arbitrary sign (written or printed) that has acquired a conventional significance | an isolated fact that is considered separately from the whole |
| a distinct part that can be specified separately in a group of things that could be enumerated on a list |
| an individual instance of a type of symbol |
| a small part that can be considered separately from the whole |