Error Undefined variable

Display the below error.

Warning: Undefined variable $rum5 in C:\Apache24\htdocs\MIS\user\pages\user_change_password.php on line 106

My Code is as below

<label for="userid" style='font-weight:bold;color:#996666;'>ID:- </label>

<?Php echo '<font color="#315E8C"><strong>'. $rum5.'</strong></font>'?>

What is the meaning of these error messages?

How to fix this?

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