matchingblock

noun
UK /ˈmætʃɪŋ blɒk/
US /ˈmætʃɪŋ blɑːk/

A matching block is a toy block you pair with another block that looks the same.

She found the matching block for the red square and put them together.


OTHER MEANINGS

2. A block in a computer program that is paired with another block to work together.

The coder connected the matching block to finish the loop.

3. A piece in a game that must be paired with an identical piece to score.

He matched the last block and won the game.

4. A section of text or data that corresponds exactly to another section.

The editor highlighted the matching block in both documents.