The plot of the film Star Trek IV: The Voyage Home revolves around the main characters traveling back in time from the 23rd century to 1986, in order to obtain and bring back a pair of humpback whales, which have become extinct at some point between the two points in time.
The motivation is driven by a space probe traveling to Earth in the 23rd century and making a futile attempt to contact any existing whales, unwittingly damaging the biosphere and putting the Federation population in grave danger. The probe's origin and, in particular, its creators, are generally a mystery in the film, but evidently have some connection with humpback whales as a sentient species.
When the main characters travel back in time, a short and mysterious film sequence occurs, representing their journey in various cryptic ways - representations of the crewmembers' heads appearing in an eerie cloud of smoke, dialogue from later in the film, a representation of a human figure falling from space down to Earth as the crew arrive in 1986.
Much of this is reasonably understandable, but one piece remains more of a mystery: through much of the sequence, the camera is traveling towards the mysterious figure shown below.
This is the obvious focal point of much of the sequence, but it is never explained in the film whether or not this figure represents a specific object or a more general concept. However, it does appear (for lack of a better term) whale-ish without directly representing a humpback whale.
A question that naturally follows is whether it represents something to do with the species that originally created the space probe, even potentially relating to their own appearance.
Has it been confirmed exactly what this figure is supposed to represent?
Ideally in something related to film canon (e.g., descriptive shooting scripts, written novelization or comic adaptation), but barring that, in any other relevant material (e.g., discussion of special effects design).
