A call warrant allows the holder to benefit from a rising market. It rises in value when the underlying asset rises in value. London Stock Exchange Glossary
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A warrant which gives the warrant holder the right, but not the obligation, to buy the underlying security at a predetermined price (the exercise or strike price), on (European style) or before (American style) a predetermined date (the expiry or maturity date). The value of a call warrant will generally appreciate when the price of the underlying security appreciates. NYSE Euronext Glossary
Financial and business terms. 2012.