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Quoting Bill Sapsis:

A "Sunday" is a loop of small diameter wire rope that is choked around
another line or bundle of lines and used to hold thos lines together and
keep them from moving. A sandbag is hung from a hemp set bundle by means of
a "Sunday".

The term comes from nautical days when, on the Sabbath, the sailors wanted
to go to church, the used the Sunday to hold their lines and sheets that
they were responsible for in place until they came back from services.
Considering the mortality rate of a sailor they tended to be very religious,
even the nasty ones.