A drawing of a knot tied in rope: which knot is it?
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Bowline. A bowline makes a fixed loop that is easy to untie after it has been loaded, for example to put a mooring line over a bollard. Leave a good tail and pull it snug.
Knot drawings from Wikimedia Commons: bowline by Hella, adapted by Tescobar (CC BY-SA 3.0);
figure of eight, reef knot, sheet bend and rolling hitch by Lucasbosch (CC BY-SA 3.0);
round turn and two half hitches by Stephan Brunker (CC BY-SA 3.0);
clove hitch by Sawims (public domain). All other pictures are SailChecker's own.