True enough, Don, technically - two notes make a dyad not a chord, no matter how many times you duplicate them. But there isn't a convenient word that includes both. "Fingerings" or "shapes" or "finger shape" all seem clumsy. It'd be less confusing to extend the word "chord" to mean any of the clever shapes we make on a fretboard (or keyboard) to produce music.

There's no particular reason that I can see that the word "chord" got defined in such a way as to include dyads, just a musical fashion. It's a bit as if the word "scale" had been defined in such a way as to exclude pentatonic scales and we had to call them something else.

Dyads are a case of the old saying "less is more". Often adding in that third note to make a chord can just spoil the sound.