empty signifier

Etymology
, apparently originally a as used by  among others (though not by  as sometimes supposed; compare the Lacanian term ). Subsequently popularised in the work of in the 1990s.

Noun

 * 1)  A signifier—that is, a linguistic sign, a label or slogan—with no fixed and delimited meaning, which can therefore be interpreted in many ways and represent a range of different beliefs and aspirations.