The meaning of robot names are very interesting.
1. XOR exactly means the boolean operator (bitwise exclusive OR - one but not both of two settings being on), very often used in programming for sprite animation;
2. RHO is the last name of one of ERE Informatique crew (Michel Rho), very often used by the company for Title Screen drawing;
3. SAM exactly means the repair company (Sam's Repair, Inc.), very often used for technical repairing.