This pronounceable four-letter domain vaguely alludes to "skull".
The name "scul" has only four characters and just one syllable. Mono-syllable names are very rare and extremely desirable. Successful brands using one syllable names include Box, Chase and Ford.
Scul.com is a dot com domain. Dot com is the most valuable domain extension. When you own a dot com, it is much easier to rank for your own name in search engines.
This domain was first registered in May 2000. Older domains have an advantage when ranking in search engines.