When using symbols that have special characters embedded in them, you need to use a string and cast it to a symbol.
q)`ABC/A / interpreted as `ABC over A.
The ‘/ error means we have misapplied /. Here’s how to create the symbol we want:
q)select from tablename where name = `$ “ABC/A”
Finally, symbols with embedded spaces are allowed, as long they are not leading or trailing:
q)`$” ABC E “
q)string `$” ABC E “