Is there a dichotomous key available for looking up LEGO pieces by progressively answering information about their characteristics? It doesn't necessarily need to fit the strict definition of a dichotomous key (namely there being only two choices per stage of identification).
- Does it have studs? Yes
- How many sides have studs? 2
- How many studs are there total? 6
- What color is the piece? Gray
might yield part number 4277927
Additional characteristics such as estimated date of manufacture or whether a piece is counterfeit may be discerned by applying the same method to non-functional features such as the font of the logo.