Can you help me find these symbols. I looked in UEB technical 160703 and found angle which I think is represented by (456, 246). I have found the bidirectional arrow (56, 1256, 2456, 1235, 135) but do not know what the symbol is for over an item. I would imagine a ray is just a bar over the previous item. I have attached a page from the math book I am formatting.
Thank you for asking. Please let me direct you to the following locations in the GTM – Guidelines for Technical Material (PDF) – for information "direct from the horse's mouth" about the signs you brought up.
The "bar over" and "simple right-pointing arrow over" are given in the list at the beginning of GTM section 12
⠱ (dots 156)
⠘⠱ (dots 45, 156)
The "horizontal birectional arrow" is on page 63 of the GTM in section 13. Information about the "directly above indicator" is discussed in GTM section 7.9
⠳⠺⠗⠕ (dots 1256, 2456, 1235, 135)
⠨⠔ (dots 46, 35)
The "angle sign" is in the list at the beginning of GTM section 11
⠸⠪ (dots 456, 246)
Attached is a document with transcriptions of specific sections from your sample print page.