Quick question: What is the meaning of the numbers? In findings they give number followed by a cdot and then another number with percent sign. P values are tre

Quick question: What is the meaning of the numbers? In findings they give number followed by a cdot and then another number with percent sign. P values are treated in a similar way, you have leading zero then a cdot more zeros and a number. What is this suppose to mean? Where can I read up on that notation?