Noun
Bat-Signal (plural Bat-Signals)
(idiomatic, informal) A thing which serves to attract or summon something.
As he leaves, the Bat-Signal lights up in the night sky as Catwoman watches from afar. Source: Internet
Get the attention of the Dark Knight with this working Bat-Signal prop. Built from high-quality materials, including metal parts, this prop rotates up and down AND swivels side to side. Source: Internet
The Bat-Signal shines on the night sky and Batman is standing on a pillar looking ahead. Source: Internet
To this end, the station is also home to the Bat-Signal and built to contain offices and accommodation for personnel and vehicles, along with locker rooms, temporary holding cells and interview/interrogation rooms. Source: Internet