hn:tldr:953c9

This command is not universally recognized or standard, so without further context or information, it is difficult to provide a precise explanation. However, based on the given command - "hn --limit ${number}" - we can make some assumptions:

1. "hn" appears to be a command or an abbreviation for a specific function or program. It could be a custom alias or an executable file.

2. "--limit" is likely a command-line argument or option that is specific to the "hn" command. It suggests that the command is limiting or setting a restriction on something.

3. "${number}" is a placeholder indicating that a numerical value needs to be provided as an argument. The "$" symbol suggests that it is a variable or parameter that needs to be replaced with an actual number when executing the command.

In order to obtain a more precise explanation, it would be helpful to provide additional context or information about the specific command or program in question.