This has been ongoing for quite some time, but it's finally reached the point where it has aggravated me sufficiently to make a post about it.
"SD", or standard definition, refers to
any of a variety of resolutions of 480 pixels in height, primarily 640x480 and 720x480.
"SD" does
not refer to any encode we produce that is of an emulator's native resolution (as opposed to the HD encodes some of our encoders produce for streaming purposes), no matter how many times the term is misused as such.
If you are looking for a name to call the class of encodes you're producing for publication purposes, try "downloadable encodes", as that's what they're intended for (possibly also "streaming encodes" for, say, the 512kb), or "primary encodes", as they're the main encode that is provided for publications.
That is all.