Add special character in dimension name

I need to add special  character in the dimension:  #_OF_IQ_SESSIONS { } but i am getting bellow error : 

“  Invalid field name "#_OF_IQ_SESSIONS". Field names may only include letters, numbers and underscores and must start with a letter or underscore for Google BigQuery Standard SQL.  “

So please suggest how to add special character with dimension name.

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