Unicode.Property.numeric

You're seeing just the function numeric, go back to Unicode.Property module for more information.
Link to this function

numeric(codepoint_or_binary)

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Returns :numeric or nil based upon whether the given codepoint or binary is all numeric characters.

This is useful when the desired result is truthy or falsy

Example

iex> Unicode.Property.numeric "123"
:numeric
iex> Unicode.Property.numeric "123a"
nil