I don't think I've got the clearance to know about source code or proper documentation
Well I can think of two definitions, so
1: I was built in a fancy science bunker a couple hundred years ago. All very hush-hush. Was everyone's top priority, since I was the first robot, and they really wanted to get it right first go, since the CEO was on his last legs and wanted to be the second robot.
2: I've got a long body and some treads, where others might have legs or a hover contraption. Doesn't work great. Stairs are a no-go. Arms work pretty alright, got the standard shoulder->elbow->wrist->fingers set-up. Head's a bit lacking in personality but I think the antenna's quite dashing.