![Okrand's Unabridged Klingon Dictionary](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/6/65/Okrand%27s_Unabridged_Klingon_Dictionary.png/revision/latest/scale-to-width-down/180?cb=20240512135813&path-prefix=en)
Among a pile of reference books
Okrand's Unabridged Klingon Dictionary was a book about Klingon language.
This book was among the works used by the USS Enterprise-A crew in 2293 to present themselves as a Klingon vessel to Morska listening post while tresspassing in Klingon space. (Star Trek VI: The Undiscovered Country)
The fictional author of this book refers to the real-world inventor of the Klingon language, Marc Okrand.
This and other similar items, including A Concise History of the Klingon Empire, were sold together in the 40 Years of Star Trek: The Collection auction. It was lot #777, entitled "UHURA'S KLINGON REFERENCE BOOKS". The winner paid US$2,880 for the lot.