What is the meaning of わ行?

the tenth and last row of the 五十音図 (literally “table of the fifty sounds”), consisting of the five kana わ/ワ (wa), ゐ/ヰ (wi), う/ウ (u) (alternatively, 𛄟 (𛄟)/𛄢 (wu)), ゑ/ヱ (we) and を/ヲ (wo), one of which is taken from the あ行 (“a-row”) to represent classical grammatical inflection in modern text

Source: wiktionary.org