The most important keys on any keyboard for an Emacs user are the Operation Keys (I made up that term). Without them Emacs would be useless. For Techne (the new name for my Emacs keyboard project) I decided to use symbols instead of letters for them.
The operations cluster is on both the left and right side of the keyboard. Yes, that is a full twenty keys just to make life happier in Emacs! I love keyboards so dedicating twenty keys to a critical task is perfect for me. These sections live on a eight row by sixteen column layout so there is plenty of room. It’s bottom left corner is position (1,1) (Row, Column) increasing as you go up and to the right (ala Cartesian coordinates). In the table I wrote the key name and then the symbol. The picture only includes the symbol.
Legend: C# (column number)
My symbol choices started with Sun’s meta symbol. After playing around with that, reading Xah’s page on Unicode input symbols, searching for and comparing symbols with PopChar and playing around with a ton of combinations I ended up here. It is nice because it settles on the diamond theme.