In drafting patent various features are decribed by refernce numerals. cannot use brackets, inverted commas, circles or outline. But if a feature 101 has a surface bonded to another feature 102 with a surface it is difficult to indicate the interface bond as all that is shown on the drawings is a single line. My thought is to use the ~ tilde symbol and the >< symbol in combination with the feature referecne numeral. for example in the above example a three leader line to the same interface line would refer to: feature 101 (for example a limb portion) has leader lines to a surface 101~a that is bonded using an adhesive 101>a< that bonds surface 101~a to a second surface 102~a of second limb portion 102b. There is a similar issue when referencing holes in a limb portion of a feature and fixings where a fixing 200 is fixed in a hole 200a and a pin 3000 is retained in a second hole in limb 200b of a feature. A two leader lines to the fixing and the pin could be referring to the hole, the limb portion, the fixing or the pin. Could therefore the ^ symbol be used e.g a limb potion 200b has a first hole 200^a and second threaded hole 200^b where the first hole retains a pin 300 and the second hole engages a fixing bolt 200^1.
The ~,><,and ^ symbols are not brackets, inverted commas, circles or an outline All of which appear in the "BASIC LATIN" keyboard symbols layout in microsoft word.