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A rectangle with corner marks, standing for capturing the display.
Also known as: PrtScn
A rectangle with emphasised corners marks the print screen key, which captures the display as an image. The name survives from the era when the key sent the screen's contents to a printer.
Marks the key that captures the contents of the display as an image file or to the clipboard.
Contexts: Software
Originally sent the characters on screen to an attached printer; the modern behaviour replaced that while keeping the name.
Contexts: Software
A wide rectangle outline whose four corners are drawn as short right-angled brackets, suggesting a frame placed around what is being captured.
Both are used in software contexts.