a small marine bivalve of the genus Placuna, especially P. placenta, common in Philippine coastal waters and some other parts of the Pacific Ocean.
2.
Also called windowpane shell, windowglass shell.the squarish, translucent inner shell of Placuna used in making lamps, windowpane, and decorative objects.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
jingle shell, Also called: window shell the bivalve shell of a mollusc (Placuna placenta) found esp in the Philippines and having a smooth translucent shiny interior: used in jewellery, ornaments, lampshades, etc