Quistion on what somthing is i dont get

question. when you finsh a job/mission you get money or a wepaon and then it also say something like rear 893 or epic 203 what ever. what dose that part mean. the quitly then a number what is that. what it mean and do. how it used

It’s just the item score I believe, which from what I can tell is more or less useless. I suppose it’d be good for the community loot hunt, but beyond that I’ve not seen anything that is matters for.