I found the next psql command:

CREATE TABLE @cdmDatabaseSchema.PERSON (
            person_id integer NOT NULL,
            gender_concept_id integer NOT NULL,
            year_of_birth integer NOT NULL,
            month_of_birth integer NULL,
            day_of_birth integer NULL,
            birth_datetime TIMESTAMP NULL,
            race_concept_id integer NOT NULL,
            ethnicity_concept_id integer NOT NULL,
            location_id integer NULL,
            provider_id integer NULL,
            care_site_id integer NULL,
            person_source_value varchar(50) NULL,
            gender_source_value varchar(50) NULL,
            gender_source_concept_id integer NULL,
            race_source_value varchar(50) NULL,
            race_source_concept_id integer NULL,
            ethnicity_source_value varchar(50) NULL,
            ethnicity_source_concept_id integer NULL );

What is the symbol @ located just after CREATE TABLE for? Is there any special meaning/advantage to its use?