On 26 June 2016 at 09:37, Costello, Roger L. <coste...@mitre.org> wrote: > > In the book Parsing Techniques the authors use a less than symbol with a dot > tucked inside for the open parenthesis and a greater than symbol with a dot > tucked insider for the close parenthesis. Also, they use an equal sign with a > dot over it. You can see the 3 symbols here: > > https://books.google.com/books?id=05xA_d5dSwAC&pg=PA267&lpg=PA267&dq=parenthesis+generator+symbols&source=bl&ots=3OwyeBndO8&sig=ZhwoeYRJjm3GTzNNP1vgsAVRisc&hl=en&sa=X&sqi=2&ved=0ahUKEwi577X-o8XNAhWBaz4KHc0QA_EQ6AEIIzAB#v=onepage&q=parenthesis%20generator%20symbols&f=false > > Are there Unicode symbols for the 3 symbols?
Yes, and they have all been around since Unicode 1.0: U+22D6 ⋖ U+22D7 ⋗ U+2250 ≐ (named APPROACHES THE LIMIT) Andrew