Given the variety of transposing instruments out there, I'd avoid any
of these details, and leave it that some instruments are
conventionally notated at a different pitch from their sounding pitch,
typically notated one tone higher (so-called B-flat instruments) or a
minor third lower (so-called E-flat instruments) than they sound.
And leave out the term `concert pitch' for this --- concert pitch just
means that the sounded A is at 440Hz, and doesn't really affect the
written notes. I can play in concert pitch on my B-flat clarinet, but
can't with my Renaissance recorder (because it's pitched to A=460Hz),
despite the clarinet music being transposed and the recorder music not
transposed.