'_text postgres data type

I get a table with type _text

create table mt ( id int8,
directions _text null)

Its not my code so I don't know what is type _text and how to work with it. I look for it in doc https://www.postgresql.org/docs/11/datatype.html but I didn't find.

My question is does anybody works with _text in postgresql? I need an examples.

Sources

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