- Keyboards of Cherry brand (Cherry is a German company).
- Original Equipment Manufacturer. It means, a typical cheap keyboard.
- “spherical angled” or “spherical all-rows”, from Signature Plastics (a USA company that makes keycaps).
- Not sure what it means.
- Not sure what it means. Probably a name originated from Signature Plastics.
Basically, key profile are of 2 types:
- Uniform → all keycaps are shaped the same.
- Non-uniform → Each row has a different shaped keycap.
There are 3 shapes of keycap's top:
- Concave (aka spherical)
- Convex. (usually for the spacebar key.)
Another issue, is how the key plate is shaped:
- Flat. (like laptop.)
- Staircase. (like a mechanical typewriter. [see Smith Premier Typewriter] )
- Curved (Example: Kinesis Advantage2, Microsoft Sculpt Ergonomic Keyboard )
I think the best key profile is uniform with concave top. Concave top helps your finger determine position of the key. Uniform is great for swapping keycaps.
Those non-uniform keycap profiles are a hack, to make up for flat key-plate. We should use a curved plate if one really want a ergonomic fit.