Definitions for "Full stop"
n. 1. A period. The thing at the end of this sentence. Back to the top
In cataloging, a full stop is a period ( . ), colon ( : ), semicolon ( ; ), question mark ( ? ), or exclamation point ( ! ).
a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations; "in England they call a period a stop"
Keywords:  admits, shutter, aperture, twice, half
A change in aperture or shutter speed that admits half as much or twice as much light.