Which term is NOT commonly used for ARPA's target persistence or afterglow?

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Multiple Choice

Which term is NOT commonly used for ARPA's target persistence or afterglow?

Target persistence on ARPA is about how the display keeps a memory of where targets have been. In practice, this shows up as fading echoes that linger over time (afterglow) or as a continuous trace of the target’s recent positions (history trails). Echo marks are marks used on the display to indicate echoes or target positions. History dots would imply discrete past positions shown as separate dots, which isn’t the standard way ARPA represents past activity. The typical approach is a fading trail or line, not a set of individual dots, so history dots isn’t commonly used.

Target persistence on ARPA is about how the display keeps a memory of where targets have been. In practice, this shows up as fading echoes that linger over time (afterglow) or as a continuous trace of the target’s recent positions (history trails). Echo marks are marks used on the display to indicate echoes or target positions. History dots would imply discrete past positions shown as separate dots, which isn’t the standard way ARPA represents past activity. The typical approach is a fading trail or line, not a set of individual dots, so history dots isn’t commonly used.

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