In the spin-off of this book, Small Steps, it says that X-Ray's real name is Rex Alvin Washburn.
it is xray
Rayon X
xray fish
The holes on your sneakers are called 'eyes'
They are called "black holes".
In Marathi, x-ray is called 'ksh-kiran'
Holes.
holes
I do not know if they have a musical name but they are commonly just called Recorder Holes.
X-Ray got his nickname in the book "Holes" because he claims to have X-ray vision when it comes to finding things buried in the ground. His real name is Rex, but he prefers to be called X-Ray because of his talent for finding objects underground.
The F holes in a cello are called... <drum roll!> F-holes! They are also called 'sound holes', and acousticians might refer to them as 'ports'.
tiny holes in the skin are called pores