In rhetoric, both chiastic structure (a literary device) and the figure of speech Chiasmus derive from their names from the shape of the letter Chi.
In RHetorIc BOth chiastiC strucTure (a lITerARy deviCE) AnD thE fiGure Of sPEech chIASmus dERIve from thEir Names frOm ThE shaPe oF tHe letteR Chi