"MRAD" and "MIL" are often used interchangeably to refer to the same concept. Both terms are commonly used to describe the milliradian-based reticle system and the angular measurement unit itself.
In this context, the reticle with dots or hash marks spaced at one milliradian intervals is often referred to as a "mil-dot reticle." The term "mil" is short for "milliradian," and it signifies the angular measurement unit used in the reticle.
Additionally, the term "Mrad" can also be used to describe the adjustment values on the turrets of rifle scopes, indicating the angular measurement per click, similar to the usage of "mildot." The adjustment value is often expressed in milliradians per click.
To summarize, "Mrad" and "mil dot" are frequently used interchangeably to refer to the milliradian-based reticle system and the angular measurement unit. Both terms denote the same concept in the context of firearms and optics