a nitrocellulose compound derived from pyroxylin, used in a solution of alcohol and ether for embedding specimens before cutting sections for microscopy
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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.