also: なみせん
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This symbol is called a tilde.
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Standard kanji spelling. The reading はせん is the most common pronunciation.
Alternate reading for the same kanji form. Less common than はせん.
Mixed kanji-kana spelling, explicitly showing the reading なみせん.
Compound of 波 (wave) and 線 (line). The reading はせん uses the on'yomi of both characters, while なみせん uses the kun'yomi for 波 and on'yomi for 線.