長音符

noun

the long-vowel mark (ー), which marks a long vowel in katakana (and less commonly in hiragana) when placed after a syllable

この単語は長音符を使っています。

This word uses the long-vowel mark.

意味（1）

the long-vowel mark (ー), which marks a long vowel in katakana (and less commonly in hiragana) when placed after a syllable