Alexandre is experimenting with Sparklines in Pharo. Read more.
Note that the code requires a Moose image built on Pharo as this already have the correct fonts.
If you want to use it in the standard Pharo image without Moose you have to go to World menu, select "System" -> "Settings" to open the settings browser. Now go to Appearance and Freetype, disable and reenable it so platform fonts get loaded.
Then for the standard fonts select some "Source Code Pro" or "Source Sans Pro" like font and apply it as the font to use.