In the middle ages, an accolade was a ceremony to confer knighthood upon a worthy individual.
On the RP repository, an accolade is an award given for helping to improve the site in some way. Most commonly, they are given to people who submit a bug report that leads to something being fixed.
LakotaSiouxWarrior has received 46 accolades for her contributions to the RP repository. Brava!