0.56 Inch Common Cathode 4-Bit Red Digital Tube is a type of 7-segment LED display module commonly used in electronic devices to display numerical values.
Refers to the height of each digit on the display (0.56 inches, or about 14.2 mm).
It's a standard size for readability in many embedded or consumer applications.
Common Cathode
In a common cathode display, all the cathode (negative) connections of the LEDs within each digit are tied together and connected to ground.
Each segment is lit by applying positive voltage to the respective anode pin.
The opposite is a common anode, where all anodes are tied together.
4-Bit
More accurately refers to 4 digits, not binary bits.
It means the display module has 4 individual 7-segment digits.
These can display up to four numerical characters at a time (e.g., "1234").