Sheldon's Mobo T Shirt in the big bang theroy

Sheldon's Mobo T Shirt

This Sheldon's Mobo T Shirt was fisrt shown in S01E13(The Friendship Algorithm),when Sheldon was trying to learn how to make freind ,so he was going to the mall to acquire a book that summarizes that current theories in the field of friendmaking.
"What's a mobo?"

Mobo = motherboard. Computer braintrust.