Change Data Point Label in biplot()

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I'm a new user of R, and trying to display the result of a PCA data set
with biplot(). Biplot() draws the projections of data points to the
first two principal axis with a text level (I guess it is the name of
the data points). This makes the picture very crowed. I tried to go
through R documentation to figure out how to change the data point
labels to a symbol, say circle, triangle or cross without text, but the
documentation did not say anything about that. I found similar questions
in archive of this mailing list but could not find a solution answer.

Can anyone help me how to change the data point labels of biplot() to a
simple symbol without text?
The help does: see the argument 'xlabs', and also '...' (for whch you 
could specify a vector for the graphical parameter 'pch').

Thanks

Yongjian

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