I want to name a process that has exactly two possible paths. I'd like to give it a symbolic name. These concepts come to mind but I'm hoping to think of others:
- coin flip
- double-edged sword
- two-way mirror
- telephone / fax
- switch track (for trains)
I'd like the concept to be widely accessible / understood. Ideally it would have a positive leaning toward it, as it will be used with medical patients.
What are some other objects / concepts that go two ways or have a choice of two paths?