The word is kopeiki, in English: copecks. A copeck is one hundredth of a rouble.
The rouble wasn't worth a lot in 1954 (it was redenominated in 1961 by knocking off a couple of noughts, so that 1 new rouble was worth 100 old ones). So losing your 3-copeck coin wouldn't have changed its owner's way of life.
3 Kopek. It translate as 3 kopek. Similar to the American cent.
The value of a 1896 Konenkn 3 piece coin can vary depending on factors such as its condition, rarity, and demand among collectors. It is recommended to have the coin appraised by a professional numismatist to determine its specific value.
You are asking about a 3 Kopek coin from the Soviet Union (the word you read as "konenkn" as actually "КОПЕЙКИ" and pronounced "kopek(ey)", and "СССР" in the cyrillic alphabet is actually short for "Союз Советских Социалистических Республик", pronounced "Soyuz Sovetskikh Sotsialisticheskikh Respublik", which is Russian for "Union of Soviet Socialist Republics" or "USSR").To value the coin, I would need to know its year and condition. Broadly, however, those issued 1924-1960 are worth US$1.00-US$15.00 (with 1924, 1927, 1958 and certain 1946, 1948 and 1957 issues worth more than that in Uncirculated condition), and those produced 1961 and later are worth less than a US dollar.