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Someone recently asked me about using letters instead of built-in symbols in JMP scatterplots. In case others are wondering the same thing, here's the long answer.
In addition to the 32 built-in symbols, you can use any character as a marker for a scatterplot. The easiest way to set a letter as the symbol for a row is with the "Other..." item in the Marker submenu. Here's an example with Big Class. After selecting all males, right-click in the row-state area to get:
That brings up a dialog where you can type a letter.
Setting the male rows to "M" and the female rows to "F" yields:
And the scatterplot looks like:
Any character in the current Marker Font (set in Preferences) is allowed, so there is a wide variety of Unicode characters available, and you can change the font preference to a symbol font for even more specialty options. Special characters can be tricky to type from the keyboard, but you can usually find them in a Unicode table and paste them into the dialog.
You can also set them through scripting. Here's a scripting example that uses the Mars/Venus male/female symbols, showing two different techniques for specifying the character.