The Apollo Guidance Computer’s display-and-keyboard unit was called the DSKY.
DSKY stood for “display and keyboard” and was pronounced “DISS-kee.” It was the astronauts’ main human interface with the Apollo Guidance Computer, combining indicator lights, numeric displays, and a calculator-style keypad. Rather than typing words, astronauts entered two-part numerical commands called Verb and Noun codes.
The DSKY was developed with the AGC by MIT’s Instrumentation Laboratory in the early 1960s. Its green electroluminescent displays showed values such as spacecraft attitude, time, and required velocity changes. The computer itself handled guidance, navigation, and control aboard both the command module and lunar module.
A common mix-up is confusing DSKY with AGS, PGNCS, or IMU. AGS was the lunar module’s backup guidance system, PGNCS was its primary guidance, navigation, and control system, and IMU was an inertial measurement unit. The DSKY was the crew-facing interface, not another navigation computer or sensor.