trajectory | BrE trəˈdʒɛkt(ə)ri, AmE trəˈdʒɛkt(ə)ri | noun (Physics) [Flug-] bahn (Fem.)
This dot stands for a unique state of the whole, which is to say that everything characterizing the system has been specified. A different state would be specified by a different dot. Thus we may imagine a system with a phase-space comprising millions of dots, i.e. any state possible in the system has a dot which represents it. Suppose now that a change is effected within the system. Then the systemic state will be indicated by a new dot which (we may imagine) lights up, whereas the dot previously lit up goes out. Then the apparent movement of light from …
In this case, the dot must have a larger free environment around it so that its Sound has a Resonance. Nevertheless, this sound remains delicate, modest and is drowned out by the surrounding writing. (Kandinsky, Punkt und Linie zu Fläche: Beitrag zur Analyse der malerischen Elemente, p. 24)
The Apollo spacecraft began its descent from behind the moon. When it again appeared within radio range the telemetry required to assess the new trajectory was missing. Ground control in Houston faced a go-nogo decision without it. History shows they made the right call.
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DOT FROM two-level-diagram