Covered Knot / Onassis Knot
This is a way to hide the knot. It is very similar to Overhand-Knot, but it is suitable for when you want to give more volume to the knot. Since the knot is covered and can not be seen, you can choose several tying process up to halfway. It is now one of Ascot-Tie's knots.
In addition, it is also called Onassis Knot in the knots of a Four-in-hand-tie, but the tying way of Aristotle Onassis[1906-1975] tie-knot which became the model was mostly Plain-Knot, and very rarely, there are photographs which seem to be Overhand-Knot.