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.
knit lace pattern with chart
Cable lace knit pattern - Panels in a fitted cardigan?
Красивый ажур спицами от Елены Аверчевой
Patterns for knitting.
The lace reminds me of arrow heads- very beautiful!
Beautiful pattern with needles