See also Using Wild Cards to Select Features
Multiple Fields can be combined by creating a label expression:
Often it is necessary to add text (e.g., a space between fields) as well:
Text can be added to labels by creating a label expression:
Labels can be 'stacked' or split onto multiple lines by inserting a 'new line (or 'carriage return') command into the label expression:
Stacking and adding text can be combined...