The twenty eighth path descends the right hand side of the Tree, joining Netzach, Victory, the sphere of desire and the natural appetites, to Yesod, Foundation, the lunar sphere of image and dream. It is one of the lower paths, worked in the part of the diagram that deals with what a person actually wants and how those wants take shape as pictures.
Its letter is Tzaddi, a Simple letter in the classification of the Sefer Yetzirah, whose name is usually rendered fishhook. The image is worth holding on to, because it is the one the path's traditional readings turn on: something drawn up out of water that cannot be seen into, a thing hooked from below and brought into view. That fits a path running from appetite into the sphere of images very well.
Its zodiacal attribution is Aquarius, the water bearer, in the standard Golden Dawn arrangement, and its tarot trump in that same arrangement is The Star.
Both of those attributions are disputed, and the dispute is well enough known to have its own name. Aleister Crowley announced in 1904 that the letter and the sign had been wrongly paired and proposed swapping this path's attribution with that of the letter Heh, a change most subsequent Golden Dawn derived work has declined to adopt. The atlas records the standard attribution here and treats the argument in its own article, because the question is about the tarot overlay rather than about the path itself.