Robotics Industry Glossary
U
UAV (Unmanned Aerial Vehicle)
An aircraft without a human pilot onboard, controlled autonomously or remotely; see Drone.
Ultrasonic Sensor
A distance-measuring sensor using sound waves above human hearing range (~40 kHz), inexpensive and widely used in obstacle detection.
Underactuated Robot
A robot with fewer actuators than degrees of freedom, relying on passive dynamics or environmental forces for some motions.
Underwater Robot
Includes AUV (Autonomous Underwater Vehicle, untethered) and ROV (Remotely Operated Vehicle, tethered) for marine exploration and infrastructure maintenance.
Unified Robot Description Format (URDF)
An XML file format used in ROS to describe a robot’s physical structure, joints, links, visuals, and collision properties.
Unimation
The company that produced the PUMA (Programmable Universal Machine for Assembly) robot, one of the first widely used industrial robots.
Unit Quaternion
A quaternion with magnitude 1, used in robotics to represent pure rotations without singularities.
Universal Joint
A mechanical joint allowing rotation about two axes, transmitting motion between non-collinear shafts.
Unmanned Ground Vehicle (UGV)
A land-based robot operating without an onboard human driver, used in military, mining, agriculture, and logistics.
Unmanned System
Any robot or vehicle operating without direct human presence, including UAVs, UGVs, USVs, and UUVs.
Unscented Kalman Filter (UKF)
A nonlinear state estimation method using sigma points for more accurate estimation than the EKF in highly nonlinear robot systems.
Upward Compatibility
The ability of newer robot software or hardware to work with systems designed for previous versions.
Usability
The ease with which operators can learn, program, and maintain a robot system, a key factor in adoption and productivity.
User Interface (UI)
The visual and interactive means through which a human communicates with a robot, including teach pendants, dashboards, and voice interfaces.
USV (Unmanned Surface Vehicle)
An autonomous or remote-controlled watercraft used for maritime surveying, environmental monitoring, and defense.