Teletext in Unicode - each character is three pixels tall, two pixels wide, with separate characters for inverse as well, and diagonals to get you from one set to another.
Intended for use with teletext graphics, but hey, do a sparkline with them, why not? Sure, it'll only do you four levels, but do you really need more than that in this use case?
Actually... they're not meant to have gaps between these lines, so: (never mind, Hacker News stripped some characters, probably because of non-BMP things, it looks like, but imagine the above on subsequent lines without a gap)
Teletext in Unicode - each character is three pixels tall, two pixels wide, with separate characters for inverse as well, and diagonals to get you from one set to another.
https://en.wikipedia.org/wiki/Teletext_character_set#Graphic...
Intended for use with teletext graphics, but hey, do a sparkline with them, why not? Sure, it'll only do you four levels, but do you really need more than that in this use case?
Previously on Hacker News: https://news.ycombinator.com/item?id=40269606