What Does DB mean on a SCSI?

I'm looking at an image that says:
NARROW SCSI: DB 25-pin connector

What does the DB mean? Not Database, not decibals, but something mysterious!

Weird... I've never asked the question either, but I do know the D is just the shape of the connector. I have no idea what the B stands for.

Quote:

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Originally Posted by Newton's Telecom Dictonary

[...]The "D" orginally described the shape of the housing. The second letter : A, B, C, D, or E originally specified the size of the housing where the "E" is used somewhat like it's used as a drawing size (i.e., smaller then a "D"). [...]

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Hey Thantos what was your Google query?

So "D" is the shape of the SCSI connector and "B" is the size type.

No google. I own that book

Quote:

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Hey Thantos what was your Google query?

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Searching "DB 25-pin connector" would have a succesful hit 3 down