Phonetic value of *18?

Melena 1987: /sto/ or /^mbo/
Palmer 2008: unknown

Sign Groups that begin with *18

*18-jo
*18-to
anthroponym *18-to-no

References

Melena, José, 1987 11th International Colloquium on Mycenaean Studies, Austin, Texas, 7th - 12th May 2000 "On the Structure of the Mycenaean Linear B Syllabary I. The Untransliterated Syllabograms"

Palmer, Ruth, 2008 A Companion to Linear B: Mycenaean Greek Texts and their World "How to Begin? An Introduction to Linear B Conventions and Resources"