1. The problem statement, all variables and given/known data What is sign convention, and how is it applied to vectors? I was reading an economics paper when I came across this term. There's a ":" sign between the vector in question and an entry, which is all supposed to output a real number. What exactly is sign convention, and how is it applied? The phrase which was used "Under the sign convention on the input–output vector". 2. Relevant equations - 3. The attempt at a solution I've tried searching for it but I found very little information on the topic.