A drawing of a knot tied in rope: which knot is it?
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Round turn and two half hitches. A round turn and two half hitches ties a line to a ring, rail or post. The round turn takes the load, so you can untie it even when the line is under strain.
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.