This pronounceable four-letter domain vaguely alludes to "skull".
Scul has only four characters and only one syllable. Single-syllable names are exceptionally rare and extremely prestigious. Examples of popular one syllable names include Shell, Dell and Ford.
This domain was first registered in May 2000. Older domains have an advantage when ranking in search engines.
Scul.com is a dot com domain. Dot com domains are the most desirable domain extension in the world, famously used by websites like facebook.com. Owning a dot com says that you own the word "scul" online.