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.
Hearts - openwork pattern for children& blouses
Fancy patrones de rejilla radios | Patrones calados
Cable and Lace Knitting Pattern
Lace Shells knitting pattern with chart