r

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r (ital.) Electricity, symbol for internal resistance
• (ital.) Maths., symbol for a polar coordinate
• (bold ital.) Maths., Physics, symbol for position vector
• (ital.) symbol for radius
• (bold ital.) Maths., symbol for radius vector
• (ital.) Ecology, symbol for rate of increase (as in r-strategist)
• Music ray (in tonic sol-fa)
• Biochem., symbol for ribonucleoside (preceding the nucleoside symbol; as in rA, ribosyladenine)

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