Code 93
A barcode symbology Intermec created in 1982 to pack more data than Code 39 into the same width.
Intermec designed it as a denser successor to its own Code 39: each character is built from nine modules across three bars and three spaces, which is where the name comes from. Two check characters (called C and K) make reading safer, and shift characters extend it to the full ASCII set.
The symbology shows up in logistics and at Canada Post among others, but never spread like Code 128, which packs tighter still. It reads on the same scanners as the other linear codes.