Sheldon Coopers Batman Logo Shirt

Replicas of this silver colored Batman logo on an orange shirt are available from a couple of different places online. Here's two that I found with a quick search.

Buy at Etsy

Buy at Bonanza

Featured on The Big Bang Theory episodes

S09 E22: "The Fermentation Bifurcation"
S10 E02: "The Military Miniaturization"

S10 E11: "The Birthday Synchronicity"
S10 E18: "The Escape Hatch Identification"
S11 E02: "The Retraction Reaction"
S11, E21: "The Comet Polarization"
S12, E07: "The Grant Allocation Derivation"
S12 E14: "The Meteorite Manifestation"