«Test Card» is a television signal specifically designed for testing equipment and transmission quality. It typically features a standardized pattern of colors, geometric shapes, and text to assess various aspects of the broadcast chain, including color accuracy, resolution, and signal stability. The specific content of a test card can vary depending on the broadcaster and the intended purpose.

Common elements found on test cards include:

- Color Bars: These bars display a range of colors, allowing technicians to check for accurate color reproduction and adjustments.

- Geometric Shapes: Geometric figures such as circles, squares, and triangles are used to verify sharpness, resolution, and geometric distortion.

- Text: Text elements are included to assess the legibility of characters, font size, and line resolution.

Test cards are crucial for ensuring the quality and consistency of television broadcasts. They are used by technicians during equipment setup, troubleshooting, and routine maintenance to guarantee a clear and accurate viewing experience for viewers.

The use of test cards predates modern digital television. In the early days of television, test cards were essential for setting up and calibrating analog receivers. While the use of test cards has diminished with the advent of digital broadcasting, they are still employed for various purposes, including testing studio equipment, transmission links, and even consumer television sets.