This pronounceable four-letter domain vaguely alludes to "skull".
Scul has only four letters and just one syllable. Mono-syllable names are extremely rare and exceptionally valued. Leading companies using one syllable names include Dell, Ford and Square.
This domain was first registered in May 2000. Older domains have an advantage when ranking in search engines.
Scul.com is a .com domain. Dot com domains are the most prestigious domain extension in the world, used by famous websites like twitter.com. Once you own a .com, it will be much easier to rank for your own name in Google.