Can't find "-" on the keyboard

[gilwood]

I have tried all the left Shift + Fn + all the F1-F10 keys and cannot find a "-". The use of F5 or F6 produce the "~". The use of F7 or F9 produce the "_". The use of the F8 or F10 produce the "+". Finally, the use of F1 or F2 produce the "|". Everything else on the keyboard appears to work as well as the charging and disconnect of my pinephone from charging using the keyboard battery. Am I overlooking something and why is there redundancy in some of the symbols produced using the F keys? Any help is appreciated. Thanks