I was not able to type pipe symbol (vertical bar) using my Mac keyboard [ shift \ ] in OS X Yosemite. Kindly help me to resolve this.

Greetings sivathanu_k,

Welcome to the Apple Support Communities!

I understand that you are unable to type a particular character on your MacBook Pro built in keyboard as you would expect. In this situation, I would recommend reading over and working through the information and troubleshooting outlined in the attached article.

One or more keys on the keyboard do not respond - Apple Support

Cheers,

Joe

How is the keyboard layout setup? See step 9 of the document that was linked earlier…

One or more keys on the keyboard do not respond - Apple Support

Confirm the layout is the correct language for your keyboard. Also consider using recovery mode just to confirm that the keyboard is functioning. The document describes using the install DVD, but this is superseded by recovery mode.

sivathanu_k wrote:

I was not able to type pipe symbol (vertical bar) using my Mac keyboard [ shift \ ] in OS X Yosemite. Kindly help me to resolve this.

Exactly what does appear when you press shift \ ?

If nothing, double check that this has not been made a trigger for something in system preferences/speech