A valid digital signature gives a recipient reason to believe that the message was created by a known sender (authentication), that the sender cannot deny having sent the message (non-repudiation), and that the message was not altered in transit (integrity).
Load index is an assigned number that corresponds with the load-carrying capacity of a tire. Most passenger car tire load indexes range from 75 to 100, but a few carry more. You'll also find the maximum load elsewhere on the tire sidewall, both in lbs and kg.
16 - This number designates the tire's diameter in inches (i.e. 16) 89 - This number indicates the tire's load-carrying capacity, known as the Load Index; as the number for the load index increases so does the load-carrying capacity (All passenger car tires in the United States are also marked with their actual load limit in pounds)