combining 3 separate arrays to one multidimensional array in bash

From man 1 bash:

Arrays
       Bash  provides one-dimensional indexed and associative array variables.  Any variable
       may be used as an indexed array; the  declare  builtin  will  explicitly  declare  an
       array.   There  is no maximum limit on the size of an array, nor any requirement that
       members be indexed or assigned contiguously.  Indexed  arrays  are  referenced  using
       integers  (including  arithmetic  expressions) and are zero-based; associative arrays
       are referenced using  arbitrary  strings.   Unless  otherwise  noted,  indexed  array
       indices must be non-negative integers.

Key phrase:

Bash provides one-dimensional indexed and associative array variables.

So, no, bash does not support multi-dimensional arrays.

I ran into this just now. There is a fairly simple solution that worked for me. I wanted to use an array that contained a device name and a screen position to display a key map for the device. I did the following: I concatenated the device name and the associated screen position into a single string, using a delimiter (in my case, I used .) that I knew would not appear in any of my values.  Then I used cut to break the composite values apart into their components when needed.  There might be a cleaner and simpler way to do this, but this is just to show that you can create a multidimensional array, in a way, in bash, even though it doesn't support it:

#!/bin/bash

# List of devices and screen positions for key maps.
DEV_LIST=( g13.+2560+30 g510s.+3160+30 g502.+2560+555 )

# This just echoes the device name and the screen position.
for DEV in "${DEV_LIST[@]}"; do
    DEVICE=$(echo $DEV | cut -f1 -d.)
    SCREEN_POSITION=$(echo $DEV | cut -f2 -d.)
    echo "$DEVICE"
    echo "$SCREEN_POSITION"
done

exit

This is somewhat similar to Coop.Computer’s answer.