what does it mean in this Visio Created ER diagram?

M

minnesotan

Please anyone help me out? i tried to google - but no luck yet.

I have a Visio created ER diagram -where Each entity describe with PK,
I1/I2 ..., U1/U2... - I know how PK (primary key works) - but couldn't
make any sense of I1, I2 or U1,U2 - what they stand for?

i am adding one table here - exactlty how it represented in Visio
diagram:

Table A
PK, I2 PID
Value (BOLD)
DiplayIndex
DefaultFlag(BOLD)
U1,U2 Vid (BOLD)
Color (BOLD)
Underline (BOLD)

anyone please?
 

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