How hard is it to say 45 degree upline, 1/2 roll centered?
Seriously, I hear people trying to come up with names for simple maneuvers and confusing themselves. Sportsman #4 is a great example. If you try to call it some kind of loop, you may confuse people with the criterial that apply. I hate to think how many people I hear referring to an up or down line as a 1/2 square loop. Loops imply a certain set of criteria. A square loop implies another set (e.g. equal radii and equal line segments). None of those criteria apply to the simple 45 or vertical up or down line. There is no "triangle" in IMAC. Some maneuvers do warrant a simple short designation, such as the Humpty Bump, the Avalanche, the Square Loop. Immelman and Split S are historical names for maneuvers developed in WW1, but most people confuse them (one is up, one is down). Oftentimes, its easier to just say Push/pull to 1/2 inside/outside loop. Its far more descriptive to the pilot in most cases.
Not trying to start any arguments, just pointing out how people often overcomplicate or overthink the very simple.