Touching a turtle's shell can elicit different sensations and reactions from different turtles, depending on the individual turtle's personality, environment, and physiological state. Generally, a turtle's shell is hard and smooth, and may feel like frosted stone or smooth porcelain to the touch.

Some turtles may enjoy being touched, especially when they feel safe and relaxed. In this case, they might slowly extend their head and limbs to indicate that they like the touch. Other turtles may feel uncomfortable with their shells being touched and will try to avoid it or retract their bodies to protect themselves.
It's important to note that a turtle's shell is part of its body, similar to our fingernails or hair, so handle turtles with respect and care to avoid causing unnecessary stress or injury. If a turtle is not interested in being touched or seems uncomfortable, respect its feelings and stop touching it.