There has been a big discussion as to what 000 means. While not an
expert, my understanding is that it means our ancestors could not write
in Polish. In my history I have records that are signed 000 and records
signed by the same people in Yiddish. It simply means that they could
not sign their names in Latin characters, so they were considered
illiterate by those in charge. They were still fluent in Hebrew and
Yiddish. Again, not an expert, but his is what I have seen.
Tempe, AZ, USA