Charts in financial markets are a mess: $ or € or £ or ¥ might be represented by different symbols on different charts. Indeed, sometimes different symbols in charts created by the same author and appearing on the same page.
A consistent set of markers would allow readers to focus more on the meaning of the data, and less on the distraction of attempting to decode the markers. Such a set of markers has been made, showcased on this page.
If you and you alone use it, then you would be consistent for your readers: a good thing. If others also use it, it would be even easier for your readers: even better. And it’s free, released under the very permissive Boost Software Licence, Version 1.0.
Start by marvelling at the gallery, then read the description. There is technical comment about the SVG code. Unhappy: before gumbling, read about good and bad grumbles. And finally, an explanation of the files.