This is a really pedantic question, but I know we have some pedants here :-)

At work today (the context would take too long to explain) I came across a musical diagram consisting of E, B, and the next octave E

It was explained as a 'chord'

To me a chord means 3 different notes. As such I said it wasn't a chord.

Various web pages I've seen give different answers.

So, Is E,B,E a chord?

Ed