The correct symbol for abbreviating feet and inches is actually “Prime” and “Double Prime” respectively.
You can read about it more here.
I’m not sure if this site will change the character but ′
is Prime and ″
is Double Prime. If you can’t copy/paste them from there, you could copy/paste them from the link above.
The link above also lists the Alphanumeric and Unicode values which are ′
and ′;
for Prime, and ″
and ″
respectively. However, I don’t believe these will output properly if put them in the custom field. So, it’s probably best to just copy/paste the actual character (or use the keyboard shortcut).
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