I googled punctuation marks and found this for you:
punctuation marks - Google Search
Ask again if you are still confused.
For punctuation marks, I know the name of:
eg commas, semicolons, colons, full stop............
A. What are the names of signs:
Can I try some?
- - -
- ___ (underscored)
- = (equal sign)
- ! (exclaimation mark)
- ( (open bracket)
- ) (close bracket)
- - (minor)
- + (plus)
B. For a sentence:
eg Bo/May will take the duty.
(does it mean Bo and May or Bo or May?)
C. I know there is another name full stop, what is it?
While C applies to your first question, B has nothing to do with it. Please start a new thread and ask the question you asked in B.
As for C, in the US, it's called a period.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
Bo or May.
"The slash is also sometimes used to denote (often mutually exclusive) alternatives, such as in male/female."
Slash (punctuation) - Wikipedia, the free encyclopedia
For "Bo and May" you would have used an ampersand (&); as in Mr. & Mrs Smith.