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Similar to "dummy text", "text filler" or "greeking". Gack is anything used in a design as a [temporary] place holder before being replaced by an actual design element. For instance, filling columns of text with "Lorem ipsum dolor...", or using a textured box where an image or other design element might go in a layout. Gack can also mean [something] in an image or design which serves a [technical] purpose that is intended to be removed in the final product, such as tracking dots on a plain wall being filmed, or a wire harness on an actor that needs to be painted out.
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