ropes

Hi! Could anyone help me find the name of this thing? I'm 90% sure it's used on boats but can't seem to find anything after hours of research see attached file (the top is supposed to be a closed hook, it's broken) thanks in advance

I am new to the trade and my aim is to develop lashing skills and eventually build skin-on-frame Aleut kayak. I started from small things (bamboo bike trailer) and I am looking now for better materials. Can anybody point me towards lashing ropes with thermo-shrinking effect? The idea is to use...