Like the lace kniting pattern on top, and precisely *that* is the one without a legend for symbols - I think the "U" is a yarn over or yo, and the downward arrow is a ~~ УЗОРЫ ДЛЯ ВЯЗАНИЯ.
Patterns for knitting.
Круговое вязание от ворота
Lace knit pattern, how nice if one were slim
Ажурные полосы спицами | Золотые Руки