The original ethernet cable was canonically ‘1968 Corvette yellow’ to distinguish it from a power cable—because you literally had to drill into it to install it

An article from PC Gamer discusses an obscure piece of computing history: the original Ethernet cable used in early "thicknet" (10BASE5) networks was manufactured in a distinctive yellow shade, reportedly matched to the colour of a 1968 Corvette, so it could be easily told apart from power cabling.