Charubel opens Sagittarius with a small visual pun: a serpent in the shape of the letter S. The wit is the meaning's front door, since S is the initial of the sign itself, and a serpent curled into it makes the creature spell the territory it is entering. But the pun opens onto older material. The S-curve is the serpent's honest signature, the shape of its actual locomotion, the double bend by which a legless body converts friction into travel; it is simply how the snake goes forward.
Read against the first degree of Sagittarius, the zodiac's sign of journeys and meanings, the image proposes a truth the arrow-sign needs at its outset: progress is sinuous. Sagittarius dreams in straight lines, the shot from bow to mark, but the living path, the serpent insists, advances by alternating curves, left compensating right, each swerve the engine of the next stretch of distance.
The degree blesses the indirect route honestly taken. There is also the inheritance the serpent carries into a sign of philosophy, wisdom's oldest animal arriving at the gate of the zodiac's teacher, instinctive knowledge presenting itself for translation into meaning, which is Sagittarius's whole curriculum. And the letterform hints at writing itself, the serpent become script, experience on its way to being told. The shadow readings are the curve without the destination, wandering that calls itself journey, and the pun's darker face, eloquence with venom in it, the S that hisses.
On a natal Jupiter, Mercury or ninth house point this degree tends to mark travellers and interpreters whose paths read as wandering and arrive regardless, and its counsel is the snake's own physics: keep bending, keep the bends alternating, and trust that the curves, honestly linked, are the straight line's living form.