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+This is the component provided by the [[Sign Upgrade|Items#sign-upgrade]].
+
+Component name: `sign`.  
+Callbacks:
+- `getValue(): string or nil, string`  
+  Gets the text currently displayed on the sign in front of the robot, or `nil` and an error message if there is no sign in front of the robot.
+- `setValue(value: string): string or nil, string`  
+  Sets the text of the sign in front of the robot. Returns the new text on the sign (which may be a truncated version of the passed argument) or `nil` and an error message if there is no sign in front of the robot.
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