average velocity symbol in axis label

The easiest way is if you have a font installed where this symbol is available (see the discussion here: http://www.igorexchange.com/node/5647).

Otherwise, if the place you want to use this has textbox formatting available, then a crude way of achieving this is the following text:
\[0v\[1\X0\S_\M\X1 more text

To understand this, I will break this into its components:
\[0 - store x-position in variable 0
v - the velocity symbol
\[1 - store current x position in variable 1
\X0 - recall x position from variable 0
\S - superscript
_ - underscore - this is now a bar above the letter v
\M - normal text (i.e. undo superscript)
\X1 - recall x position from variable 1
more text - you can continue with text from here as normal.

Hope this helps,
Kurt

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