putting a ' in a title

How do you put a prime (') in a figure title?

eg I want my title to me: U' squared

title(' U' squared ') ...obviously doesn't work?

Thanks

Answer 1

[Daniel Shub]

You were so close, you need an extra '

title(' U'' squared ')

[Chris ODonnell]

brill thanks

[José-Luis]

Please accept an answer if it helps you.

[Igor Gitelman]

thanks a lot vary helpful

[John]

thank you