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Is it possible to display the site UUID on a Drupal 8 module?
"display" is pretty ambiguous, but you can get the site UUID like so:
$uuid = \Drupal::config('system.site')->get('uuid');
(depending on context, injecting the config.factory service would be preferable)
It's a string so rendering it will be easy.
for you Drupal 8 site
drush config-get "system.site" uuid
or if you need to change it
drush config-get "system.site" uuid "number you want"
Required, but never shown