The flash provides the C90TFS Flash driver of Kinetis devices with the C90TFS Flash module inside. The
flash provides general APIs to handle specific operations on C90TFS/FTFx Flash module.
I find references like this scattered in the API docs and source files. Based on context and some Googling my best guess is that TFS is thin film storage and the C90 part means that it's a 90nm process. Is this so well-known that it doesn't need to be defined? Google comes up with fewer than 700 hits, most of them in other languages or duplicates. I've never seen it referenced in any of the device reference manuals. Constantly coming across things like this makes me wonder if there's some cache of NXP/Freescale documentation I'm supposed to know about but I've somehow never seen.