I know, I know. HDR stands for High Dynamic Range - images that, by use of an HDR plug-in or stand-along program, have a higher dynamic range than a straight-out-of-the-camera shot.
Well, I think HDR stands for the following:
1) High Dynamic Range, of course.
2) High Depth Range, because by increasing the details in a scene, the HDR image has a high sense of depth. For example, compare the top image to the bottom image. The bottom image has a greater sense of depth.
High Do-it-Yourself Rockin' Images, because you really can create some awesome and artist images with a few clicks of a mouse - or taps of a stylus.
For more info on HDR, see the pluginexperience.
Explore the Light,