What does DB9 stand for?

What does DB9 mean? We have 3 definitions. Read most used DB9 meanings below.

DB9 — D sub-miniature 9
DB9 — D-shell connector - One of the family of connectors: The "D" is the shape of the shell, the next letter determines connector size, and the number is the maximum pin count.
DB9 — David Brown (Aston Martin car model)