in calendar, right of clock number, what does small triangle mean

[Guest]

In the Calendar view, just to the right of the numbers for the time of
appointments, there is a vertical white strip that is filled differently
depending on if one says, open, busy, out of the office, etc. On one
appointment there is a small triangle in the upper part of that spece. What
does it mean?

 

[Brian Tillman]

In the Calendar view,

Which Calendar view? Day/Week/Month, Active Appointments, Events, what?

just to the right of the numbers for the time of
appointments, there is a vertical white strip that is filled
differently depending on if one says, open, busy, out of the office,
etc. On one appointment there is a small triangle in the upper part
of that spece. What does it mean?

I think the one you're referring to means "More Items". See if the icon you
see is listed here:
http://www.howto-outlook.com/howto/icons.htm