1U is a smaller panel format, often called a tile, that fits in a row one rack unit tall. It is meant to be used alongside 3U modules, typically in extra rows above or below them, and it uses Eurorack power and 3.5 mm jacks.
Two sizes exist. Intellijel’s 1U panels are 39.65 mm tall, and Pulp Logic’s are 43.18 mm tall, so the two are not interchangeable.
