Page 185 - Bob Holtzman "The Field Guide to Knots How to Identify.."

11. Slipped Figure 8 Knot

Also known as: Figure of 8 Knot or Flemish Knot with a Drawloop

As easy as it may be to untie a Figure 8 Knot, placing a drawloop in the
working end to “slip” it makes it easier and quicker still.

Uses: stopper that can be quickly untied to pull through an opening

Pros: quick and easy to tie; nearly instantaneous to untie
Cons: will not stop a hole larger than an Overhand Knot

Instructions

1. Make an overhand crossing turn, pass the working end back under the standing part, and form a bight in
the working end.

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