In the market watch in MT4, there are several symbols. Some of them could be binary Options. 

Different brokers have different method of representing a binary Options symbols. 

For eg: 

some broker use   .bo  at the end 

Some broker use   _OP  in the names

Other broker may use some other methodology. 

so, it may become confusing to ensure whether a symbol is Binary Options or not. 

In the attached code, we use  MODE_PROFITCALCMODE to detect if a symbol is binary Option or not. 

This is very sure shot method of detecting a binary Option symbol

The code iterates through all the symbols in the market watch and detects those symbols which are binary Options.