i believe this is called straight hangman knot or simple slip knot. Easy and adjustable yet also had strength to hold its own. Tried to apply this on safety shoes and it won't come undone even after it get snagged or tripped
Bunny ears knot are the easiest yet also the most unreliable knot there is. Other knot such as square bow and this adjustable hangman knot are better in terms of versatility and strength.