Advanced Symbol Mapping With Wild Card Character, First in Class by any Bridge to Offer That A wildcard characters is a special character that represents one or more other characters. A wildcard character is a special character that represents one or more other characters. A wildcard character is used to substitute one or more characters in a text.Wildcard characters are not Limited to IAB, these are used everywhere even in your Computer File Search. Example if you want to search all PDF in computer just mention *.pdf, where * means whatsoever character just search and pdf says that only PDF files. For more Detailed Explanation You May Refer Here.