Shtan is the “sh” sound.
There is no rune poem for Shtan. It is a Northumbrian Rune.
Shtan means stone, a symbol of permanence, durability, foundation, and timelessness. As a rune for the week, Shtan embodies those qualities, and indicates that they are at present and active when it appears in a reading. This week might be a time to work on ones foundational elements, and see if things are as permanent and durable as you believe (or desire). It might also be dealing with things that are resistant to change, and having to struggle through, changing yourself in order to respond to the situation, or just putting up with it.