Huá-hŏk hù-hô̤ (化學かがく符號ふごう), bô hô̤ lā̤ Huá-hŏk gé-hô̤ (化學かがく記號きごう), sê găk huá-hŏk diē-sié dò̤-lā̤ biēu-sê huá-hŏk nguòng-só, guăng-nèng-gĭ gâe̤ng huá-hăk-ŭk gì sáuk-siā, găk Ĭng-ngṳ̄ hô̤ lā̤ chemical symbols.
R {\displaystyle {\ce {R}}} găk īu-gĭ huá-hŏk diē-sié dò̤-lā̤ biēu-sê tĭng (烴), X {\displaystyle {\ce {X}}} dò̤-lā̤ biēu-sê lū-só (鹵素).