We /wiː/ is the first-person, plural personal pronoun (nominative case) in Modern English.
A nosism is the use of 'we' to refer to oneself.
A common example is the royal we (Pluralis Majestatis), which is a nosism employed by a person of high office, such as a monarch, earl or pope.
The editorial we is a similar phenomenon, in which editorial columnists in newspapers and similar commentators in other media refer to themselves as we when giving their opinions. Here, the writer has once more cast himself or herself in the role of spokesman: either for the media institution who employs him, or more generally on behalf of the party or body of citizens who agree with the commentary.
Similar to the editorial we is the practice common in scientific literature of referring to a generic third person by we (instead of the more common one or the informal you):