This is the 16674th most frequent Russian word.
сим
"Сим" means "this" or "here" in archaic or poetic contexts.
In this sentence, 'сим' is an outdated or poetic form of the word 'этим', meaning 'this'. It is employed to give the sentence a formal or poetic tone.
Сим сердечным письмом я выражаю свою благодарность.
With this heartfelt letter, I express my gratitude.
Here, 'сим' is used again as an archaic substitute for 'этим', referring to specific rules previously mentioned. It's used in more formal contexts.
Будьте внимательны: сим правилам следовать строго обязательно.
Be attentive: following these rules is strictly mandatory.
In this usage, 'сим' stands for 'этим' and pertains to 'thus' or 'in this manner', providing a classical touch to the manner of expression.