IPA Null Consonant

Can someone advise me how to represent a null consonant in phonetic notation
using Unicode ?

I have seen a null consonant initial or final variously represented as a circle,
a slashed circle, a zero or a slashed zero in printed sources, but am not sure
what the correct form of the glyph is, or how it should be encoded in Unicode.

Neither my copy of the "Principles of the International Phonetic Association" or
the IPA web site (http://www.arts.gla.ac.uk/IPA/ipa.html) seem to be of any 
help.

Andrew


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