Obsidian - Sharpen your thinking No one else can read them, not even us Your mind is unique With thousands of plugins and themes, you can shape Obsidian to fit your way of thinking Your knowledge should last Obsidian uses open file formats, so you’re never locked in You own your data for the long term
Obsidian - Wikipedia Obsidian can be used to make extremely sharp knives, and obsidian blades are a type of glass knife made using naturally occurring obsidian instead of manufactured glass