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Warrant

What does it mean?
A derivative security that gives the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time ­frame­. Warrants are often included in a new debt issue as a "sweetener" to entice investors.

Investopedia says...
The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months.

From investopedia.com