The Systems entry for alchemy says the notation was deliberately ungoverned — secrecy was the working method, so the same mark differs between two manuscripts of the same decade. This is what survived of it, as Unicode recorded it: 128 characters, U+1F700–U+1F77F, each with an official name.
The names are the collection. Nobody wrote them as poetry — they are catalogue entries in a standards document — and they read as an inventory of what an alchemist thought the world was made of.
§A dead notation that is still growing
116 of these arrived together in Unicode 6.0 (2010). The other 12 did not, and they are marked above. They are almost all bodies discovered after alchemy ended — dwarf planets and asteroids given planetary symbols in the old manner, centuries after the practice that invented the manner: Lot Of Fortune (15.0), Occultation (15.0), Lunar Eclipse (15.0), Vesta Form Two (17.0), Astraea Form Two (17.0), Hygiea Form Two (17.0), Parthenope Form Two (17.0), Haumea (15.0), Makemake (15.0), Gonggong (15.0), Quaoar (15.0), Orcus (15.0).
A notation with no governing authority, no practitioners and no purpose is nevertheless still being extended, because astronomers keep finding things that need a sign. It is the clearest evidence on this site that a symbol system can outlive the belief that produced it and remain usable.