palph is a hard-to-read font. It supports katakana and hiragana.
Lower case is the mirror character.
palph_half https://fontstruct.com/fontstructions/show/1265966/palph_half
palph_rin https://fontstruct.com/fontstructions/show/1329376/palph-2
based on a 3×7 grid, this just skirts the edge of illegibility. originally posted 26/08/2004 http://www.splintered.co.uk/experiments/50/
This is a clone of 3x7 pixels