Text based Rainmeter Visualizer. Can use any (4-digit) unicode characters to form a bar.
Wikipedia lists the codes as U+0000, just paste the four hex digits into the settings skin.
ඞAmogus0d9e⛏Minecraft26Cf⌔Diamond2314◾Small Square25FE◼Medium Square25FC■Large Square25A0⌓Semi-Circle2313○Small Circle25CB◯Large Circle25EF●Small Filled Circle25CF⚫Large Filled Circle26Ab◊Lozenge25CA⛛Triangle26DB♥Heart2665
Some characters are smaller than others.
Small and un-even font sizes may cause the visualizer bars to clip around the edges.
It's generally better to have fewer large bars than many small bars.