What is the meaning of "ذ‌‍ٰلك" in Quran 2:2?

Assalamu Alaikum, What is the meaning of "ذ‌‍ٰلك" in Quran 2:2? Many or even all Quran translaters have translated it as "This". But in an Arabic-English I found Arabic word for "This" is "ذا" or "هذا". And word "ذٰلك" in not present in the dictionary and it appears to be a combination of two words; "ذا" (this) and "لك" (yours). So why it is not translated as "This yours"? Please can you explain me its real meaning or why/how it is translated as "This", as I have very less knowledge of Arabic language. I shall be very thankful to you.