Borg Alphanumeric code.
The knowledge of a lifeform was assimilated when they became part of the Collective, the Borg knew the language of every drone.
Despite this the Borg used alphanumeric code as their written language and for encoding and transmitting data throughout the Collective. Their language consists of circular symbols with geometric shapes cut out of them. These symbols can be seen on various control panels, labels, and viewscreens within Borg structures. It is written in many different directions: in horizontal lines going from left to right and right to left, and vertically. As the name suggests, the symbols represent both alphabetic characters that represent sounds; and numbers; with much Borg terminology comprising alphanumeric sequences.
The code is immensely complex and consists of at least 50 characters and was, among other places, stored in data nodes. Despite its complexity other species could learn it. (VOY:"Revulsion")