R
A series of caches based on the letters of the Greek Alphabet. There are 24 letters in the Greek alphabet. They've been around since around 850BC. The Greek alphabet is itself derived from the Phoenician alphabet. The Greek alphabet has itself been the basis of other alphabets including the Latin alphabet.
Modern Greek letters today, are used for symbols in mathematics and science. amongst other things.
"Rho" is the 17th letter of the Greek alphabet. It is derived from the Semitic word for head. Rho has religious significance in Christianity. When combined with the character chi, Χ it represents Jesus Christ.
The cache is a small lock and lock box placed at chest height.