What is the meaning of か?

The hiragana syllable か (ka). Its equivalent in katakana is カ (ka). It is the sixth syllable in the gojūon order; its position is か行あ段 (ka-gyō a-dan, “row ka, section a”).

1. marks a statement as a question

   marks a statement as a question

   used to make suggestions: shall we … ?; could we … ?

   used to issue commands: would you … !; will you … !

   1. marks indefiniteness: some

      marks indefiniteness: some

      marks doubt or supposition: perhaps, maybe, whether ... or not

      カ, ヵ: used to mark uncertainty in non-conversation factual statements, such as data or proofreading

      1. marks a disjunction: or

         marks a disjunction: or

         very

         forms 形容動詞 (keiyō dōshi, “-na adjectives”) from stems, indicating the state or feeling of an object

         Source: wiktionary.org