か゜ symbol
How is it pronounced? Is this a kana, or not? Does it have any meaning? In which cases it used?

Question

Answer

To tell you the truth, Omar, there is not such symbol in kana. I don't know where you found it but it must have a mistake or something else.

Answer

か is a symbol in kana, but か゜ is not.

You can only use "゜"　for は、ひ、ふ、へ、ほ(ha, hi, fu, he, ho): ぱ、ぴ、ぷ、ぺ、ぽ(pa, pi, pu, pe, po).

Answer

its ka, its the hiragana version. its pronounced k-a the family is ka, ki, ku, ke, ko

k-a
k-E (the sound is saying the letter E)
k-oo
k-e
k-oh

Answer

http://en.wikipedia.org/wiki/Ka_%28kana%29

"A handakuten (゜) does not occur with ka in normal Japanese text, but it may be used by linguists to indicate a nasal pronunciation [ŋa]."

Answer

http://ja.wikipedia.org/wiki/%E3%81%8B%E3%82%9C

Read it, or use Google translate.