I'm not sure I'm familiar with the term, is it a scope with an illuminated reticle? In that case it's simply a regular telescopic sight that has the ability to "light up" its crosshairs to make them more visible when the target is dark. Most of the examples I've seen are battery powered, but there are some (higher dollar scopes, usually) that use light pipes or tritium to light things up. Oftentimes, the light level can be controlled via some sort of rotating switch or push buttons.
What kind of scope is it? I'm interested to learn more if it's not what I'm thinking of.
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