I was going to suggest using the new 2x4 unicode or Teletext glyphs, but they didn't exist in 2011. Is anything like this included in Linux distros? I couldn't find it in Fedora's or Ubuntu's repos. I guess I'll try my hand at making a new one. Might as well use it as an excuse to learn Rust.
Braille characters would double the horizontal resolution but halve the already limited vertical resolution, which isn’t great for something that’s intended to be displayed inline with text.
I think Teletext might be even worse. IIRC, it only has three heights for its triangles.
If you’re interested in multiline plotting with braille characters, Ian Henry’s bytemap for Janet (https://github.com/ianthehenry/bytemap) is worth a look (or my Clojure port: https://github.com/waddie/bytemap.clj).
Similar first commit dates in the two repositories, it looks like there must have been some kind of trend around that time ;)
Anyway, this field has more famous people than anyone can keep track of; I hadn't heard of Zach Holman until just now either. For what it's worth, zx2c4 is also fairly well known for WireGuard.