The traditional East Asian stamp has served as a signature for many years and is still commonly used today to impart authenticity where authorship is of importance (i.e., legal documents, art).
 
This particular combination of characters means Ten Dreams and is pronounced as my given English name is in Japanese, Tomu ("to", as in token and "mu", as in "a cow says moo".  Although, the Japanese are convinced a cow says "moe", but we'll leave that alone for now.)
 
My personal inkans (Japanese stamp) were designed and crafted by Mr. Tatsuo Furugori,  at the request of Mrs. Ritsuko Kuriyama and given to me as a gift by a close personal friend. The stamps are made of alabaster with the characters carved into the bottom.  The red seal paste is pulverized cinnabar, mixed with castor oil and silk strands.
 
I am indeed thankful to each of them for this kind gesture.