This is part of a model number for a product manufactured by Methode. The first three digits of the model number represent the model number of the product, in this case 958. The two hyphens that follow represent two seperate digits, in this case 13. The rest of the model number contains additional identifying information about the model, such as its size, material, and type. In this case, the model is a 68SM15-23T7, meaning it is a size 68, SM15 material, and Type 7.