Counterintuitive: contrary to what common sense would suggest.
Nomenclature: A system of naming; terminology: a system of words used to name things in a particular discipline; “legal terminology”; “biological nomenclature”; “the language of sociology.”
Example as used by Ed Bott to explain the system and boot partition:
The boot partition is the partition where the Windows system files are located. On most systems, this is the same as the system partition. On a multiboot system, where drive C contains files from an earlier Windows version and you’ve installed Windows XP to drive D or drive E, the boot partition is identified as such in the Disk Management window. (And yes, we know that it makes no sense to say that the boot files are on the system partition and the system files are on the boot partition. However, this counterintuitive nomenclature has been a part of the Windows NT family since the earliest days and isn’t likely to change any time soon. )
