Electronic – What does “Piggy” mean in this Schematic

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Schematic

What does the word "Piggy" mean in this schematic diagram?
I found some sections of a schematic where a part is denoted as "Piggy".
What does it mean?

Best Answer

The block might be "piggy backed".

A piggyback board is an extension or a daughter board.

Thus in this case it means that the V35/X21 module is located on a daughter board.

Here an example:

Example