[Geocoding] does Nominatim use PostGIS?

[Yang]

I read the wiki briefly, it says osm tools convert osm data to PostgreSQL
format, then it could be manipulated using PostGIS.

I downloaded Nominatim,  it does have some code like "postgresql.c" that
kind of suggests the use of PostgreSQL. but does it actually use PostGIS
(and its "tiger" geocoder)?

thanks
Yang
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