The term 'CROSS TYPE' can be solved by the three-letter word 'TAU'. The letter 'TAU' is the 19th letter of the Greek alphabet and is also used in mathematics and science. In mathematics, it is used to represent a circle constant equal to 2π, and in science, it is used to represent the lifetime of an unstable particle. In Christianity, the TAU cross is a symbol of salvation and is often used as a sign of devotion.