Well I am not participating to this discussion to solve a personal problem Actually I am not going to use geometric algebra I just want to know if there is a convenction or not And I thought it was interesting to show that any preference has its pros because you seemed to be interested in defending a particular preference Do you mean you never look at numbers to understand if your calculations are correct There exist some people I guess who use geometric algebra for practical purposes People who express measured or estimated physical quantities using multivectors And if they do they for sure are going to look at the numbers Results must be interpreted discussed understood Programs must be tested Their output can not be accepted blindly Then results may be shared may be sent to other people or the output of a function may be used as input for another function And this is why I believe a convention might be useful see Relevance