[tex-live] Howto include unicode character?

[Neal Becker]

I have recent texlive. 

\documentclass[10pt,a4paper,english]{article}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\begin{document}
What is π
\end{document}

I get:
! Undefined control sequence.
\u-default-960 #1->\textpi 
                           
l.5 What is π
              
? 
! Emergency stop.
\u-default-960 #1->\textpi 

Any clues?