水平方向を表す用語になります。
対になる言葉として、垂直方向を表すVertical（バーティカル）という用語があります。
※<a href="https://www.gameassetstudio.com/ja/word?index=V#vertical">Vertical（バーティカル）</a>の項目を参照
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#0 /home/granzella009/gameassetstudio.com/public_html/gas/wp-content/themes/game-asset-studio/index.php(45): include_once()
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#2 /home/granzella009/gameassetstudio.com/public_html/gas/wp-blog-header.php(19): require_once('/home/granzella...')
#3 /home/granzella009/gameassetstudio.com/public_html/index.php(17): require('/home/granzella...')
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