Based on the search results, "RainbowKey" most likely refers to the 191 - KW1 Rainbow Key Blank Go to product viewer dialog for this item.
A decorative "Rainbow Key Chain" is available, featuring the text "THE JOY IS IN THE JOURNEY". {RainbowKey}
Manufactured with durable metal construction, the key is designed for long-lasting daily use. Based on the search results, "RainbowKey" most likely
Rainbow tables (Oechslin's paper) are used in cryptography to increase the success rate of attacks using hash functions. Based on the search results