Is the query right?

Neo4j Graph Platform Cypher
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Can someone confirm if the above query right at line 9, if so can someone explain me what does "i" here mean, like what does it represent or point?

The above code was a part of Turn a Harry Potter Book into a Knowledge Graph | by Tomaz Bratanic | Neo4j Developer Blog | Medium this article.

I know it's setting property weight to nodes, but where did that "i" come from, because we are using "row" as the pointer.

Thanks in advance.

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MERGE (a)-[i:RELATIONSHIP]->(b)
When you pass a string or char followed by a : like this you're declaring a variable. If you doesn't do this, like: MERGE (a)-[:RELATIONSHIP]-(b) you would need to set the relationship properties within the MERGE query.

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