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invisible GIF
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A single-pixel GIF file set to a transparent status and thus invisible. Also known as a "transparent GIF," "1-by-1 GIF" and "clear GIF," it is is used as a tracking mechanism for Web pages to monitor a user's activity. See Web bug and GIF.

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1-by-1 GIF
1x1 GIF

clear GIF
e-mail tracker

transparent bitmap
transparent GIF

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space station
Space technology
space travel
space-cadet keyboard
Space-time
space/time
spacecraft

Spacer GIF
SPACEWAR
Spada, Lionello
SPADE
Spade, Sam
spadefish
spaghetti
spaghetti code

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