Does anyone know why all the times symbol x (Unicode: 00B4) would change to a multiplication dot (Unicode: 00D7) in Euclid Symbol by itself?
Recently, I have been having many issues with InDesign reading Euclid Symbol. The problem is that we have thousands of MathType eps files that use this font and want to avoid just switching to another font because it won't be consistent between the text in InDesign and the MathType files. Disclaimer: All the MathType files were saved out as eps/none.
I do not own a version of the Euclid font so I can't verify whether it has the characters you want to begin with. Most fonts do not have a set of math symbols in them, other than the basics, and multiplication x is not a common symbol on most fonts.
When a particular Unicode symbol isn't available on a font, applications often swap in a dot, circle, tofu block, or space for the missing glyph.
Verify the Unicode glyph codepoints (their numbers) for the symbols you want. Use the math symbol charts at https://www.unicode.org/charts/ (scroll to the second page for math).
And then check your Euclid fonts in a font manager program that shows its complete character set. (You can use InDesign's Glyph panel to view the complete set.) Check to see if your version of Euclid actually has the glyphs you want.
Make sure the EPS files have their fonts embedded into them. That's usually done in the source program when the EPS is exported.