define a new language that contains words that are with numbers and letters such as 'IL9op'

The language you are describing is called a " m ixed al ph ab etic - numeric language ." It is a type of language that uses both letters and numbers to represent words or phr ases . In this language , the word " IL 9 op " would be a valid word . Other examples of words that could be represented in this way might include " 1 2 3 4 5 6 7 8 9 " or " abc def gh ij ". This type of language can be useful in certain context s , such as when communic ating with people who are not prof ic ient in a particular language , or when trying to convey information in a way that is easy to understand for a wide range of people . </s>