What is the meaning of は?

The hiragana syllable は (ha). Its equivalent in katakana is ハ (ha). It is the twenty-sixth syllable in the gojūon order; its position is は行あ段 (ha-gyō a-dan, “row ha, section a”).

marks the topic of the clause, sentence, or conversation

what about, how about, and (used without a predicate to ask for more information about something)