PG Unpivot ?

psql (13.2, server 15.3) on linux

I think they call this "unpivot" in MSSQL ?

How can I get an sql query to return one line per column with... an ID,
column name and value. the ctid for the id field is fine.

Example:
dvdb=# create table unpivot (intcol integer, floatcol float, strcol
varchar);
CREATE TABLE
dvdb=# insert into unpivot (intcol,floatcol,strcol) values
(1,1.1,'one'),(2,2.2,'two'),(3,3.3,'three');
INSERT 0 3
dvdb=# select * from unpivot;
intcol | floatcol | strcol
--------+----------+--------
1 | 1.1 | one
2 | 2.2 | two
3 | 3.3 | three
(3 rows)

I want 9 records returned, each row with 3 cols, 1st col is the ctid,
second is the column name, third is the val.

Thanks in Advance !