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The dot mean that the program is converting from one data type to another. They are compatible but something is different. It was developed to make you aware because this conversion takes time for executing the code. If you have coercion dots it will take longer for your code to execute.

Here is what the help file from NI says:

Eliminating Coercion Dots to Maintain Accuracy and Optimize Memory Usage
Coercion dots can affect memory usage or overall performance of a VI in the following ways:

Type definition coercions—If you wire an instance of a type definition to an object that does not link to the same type definition, the VI may generate inaccurate results.
Scalar numeric coercions—If you manipulate different numeric types, LabVIEW coerces the data types to match. When this coercion occurs, the VI may generate inaccurate results.
Large array coercions—If you coerce the data type of a very large array, the VI may use a large amount of memory and take longer to execute.

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