Are there Unicode symbols for parenthesis generator symbols?

[Andrew West]

On 26 June 2016 at 09:37, Costello, Roger L. <costello at 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